Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

Two types of new lanthanide coordination networks, [Ln3(pdc)4(Hpdc)(H2O)3]·8H2O [H2pdc = pyridine-2,4-dicarboxylic acid; Ln = Ce (1), Pr (2), Sm (3), Eu (4); type A) and [Tb5(pdc)4(Hpdc)]·3H2O (type B), have been synthesized using a hydrothermal synthetic method. The former type A compound has an unfamiliar architecture, even basically comprised of primitive cubic (pcu) topology, and demonstrate porous gas adsorption behavior, giving several hundreds of square meters per gram surface areas after evacuation of the water molecules, while the latter type B compound does not show any porous properties. Most interestingly, the solvothermal synthetic method using N,N-dimethylformamide (DMF) as a solvent gives compounds that crystallize in a structure analogous to that of type A for Ln = La-Ho, probably formulated as [Ln3(pdc)4(Hpdc)·(DMF)m]·nDMF. These compounds also exhibit large surface areas after evacuation of the DMF molecules and also moderate amounts of hydrogen gas uptake at 77 K. The luminescence properties were investigated for Eu and Tb analogues at elevated temperatures, at which an unusual increase in the emission intensity was observed upon the release of solvents, and discussed based on their porous structure.

DOI： 10.1021/acs.inorgchem.1c02431

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Monoclinic CaV2O6 (under 100 nm in diameter) phosphor was obtained via a water-assisted solid-state reaction (WASSR) method at 80 degrees C-120 degrees C and exhibited red emission at room temperature. The estimated average particle size, ratio of the V5+ ion (the emission center) in the structure, and optical properties were investigated through scanning electron microscopy, X-ray photoelectron spectroscopy, electron spin resonance spectroscopy, UV-vis spectroscopy, and fluorophotometric analysis. The average size of the particles obtained using the WASSR method was less than 100 nm. Compared with CaV2O6 obtained using the conventional solid-state reaction method, the amount of V5+ in CaV2O6 was 16% higher and the emission intensity was 1.4-fold higher by using the WASSR method.

DOI： 10.1149/2162-8777/ac2e4c

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Melt quenching method was applied to prepare the long persistent phosphor SrAl2O4:Eu2+,Dy3+, and Dy(3+)concentration dependence of afterglow property was investigated. Melt quenched SrAl2O4:Eu2+,Dy3+ phosphors exhibit brighter afterglow intensity compared with these synthesized by a conventional solid-state reaction method. The afterglow property was improved with increase of Dy3+ concentration, and 10 mol% Dy3+ co-doped sample exhibits approximately 1.3 times higher afterglow intensity than commercially available phosphor. (C) 2021 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.20235

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We investigated the adsorption of carbon dioxide (CO2) at room temperature on alkaline earth metal ion-exchanged titanate nanotubes using Fourier transform infrared (FT-IR) spectroscopy and volumetric adsorption. CO2 adsorption capabilities were found to increase with increase in the ionic radius of the alkaline earth metal ions exchanged. Alkaline earth metal ion-exchanged titanate nanotubes exhibited the characteristic IR bands responsible for the nu(3) asymmetric stretching vibration of a CO2 molecule depending on the ionic radius of the alkaline earth metal ions exchanged. From the relationship between the shifted value from the free CO2 gas for the observed frequency and electrostatic field, we concluded that electrostatic forces are dominant driving forces for the interaction between CO2 and the alkaline earth metal ion-exchanged titanate nanotubes.

DOI： 10.1016/j.vibspec.2020.103088

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Copper-ion-exchanged MFI-type zeolite (CuMFI) has been reported to effectively interact with propane (C3H8) even at room temperature and this sample has the potential of being used as a CH- bond activation material. In this study, we examined the interaction between CuMFI and C3H8 at various temperatures. The adsorption isotherms of C3H8 showed that CuMFI exhibits strong adsorption at 573 K. For CuMFI treated at temperatures above 573 K under a C3H8 atmosphere, a characteristic infrared (IR) absorption band was detected at 1542 cm(-1), which was hardly observed for other samples such as NaMFI and HMFI. This band was assigned to the CC stretching vibration mode of propene (C3H6) species adsorbed on CuMFI. Therefore, the C3H6 species were produced by the contact of CuMFI with C3H8 at approximately 573 K; propane dehydrogenation occurred. This temperature (573 K) was lower than the reaction temperature for propane dehydrogenation, which had been reported to be temperature around 773 K or higher.

DOI： 10.1016/j.vibspec.2019.103016

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

Rare earth free white emitting Na2TiSi1-xGexO5 phosphors were synthesized by a conventional solid-state reaction method, and the photoluminescence properties were characterized. The phosphors obtained in the present study showed broad bluish-white emission with a peak at 485 nm due to the charge transfer transition between O2- and Ti4+ and the emission peak intensity was effectively enhanced by the Ge4+ doping in the Na2TiSiO5 crystal lattice. The emission peak intensity of Na2TiSi0.5Ge0.5O5 was 1.35 times higher than that of Na2TiSiO5 and the CIE chromaticity coordinate values for the phosphor were x = 0.29 and y = 0.38.

DOI： 10.36410/jcpr.2019.20.5.460

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Biogenous iron oxide microtubes (L-BIOX) are interesting substances that exhibit high potential for application as a practical material. However, the nature of the L-BIOX surface, which is the working site for various phenomena, has not yet been completely clarified. We conducted experiments to elucidate the surface properties of L-BIOX, which interacted with methyl red at room temperature in the dark, depending on its calcination temperature. (C) 2019 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.matlet.2019.05.130

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© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. Mg-doped LiSrPO4:Eu2+ (Li(Sr, Mg)PO4:Eu2+) phosphors, in which some Sr2+ ions were replaced by Mg2+ ions, were prepared using a conventional solid-state reaction method. The crystal structure of the phosphors was hexagonal, which is the high-temperature phase of LiSrPO4, even though synthesis was carried out at a relatively low temperature of 900 °C. Fluorescence could be efficiently excited in the 220–400 nm ultraviolet region, and bright blue emission was produced with a peak at 448 nm. The emission intensity was higher than that for LiSrPO4:Eu2+ without Mg doping, and a lower Eu content (1 mol%) was required in order to reach the maximum intensity. These results indicate that the blue-emitting Li(Sr, Mg)PO4:Eu2+ phosphor is a promising candidate for phosphor-conversion white Light Emitting Diodes.

DOI： 10.1080/14328917.2018.1482650

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Based on a proposed new materials design concept, we succeeded in discovering a new red-emitting oxide phosphor, BaCa2Y6O12:Ce3+, via a melt synthesis technique using an arc-imaging furnace. Rietveld refinement using X-ray diffraction data gave the crystal structure of the obtained phosphor, which has the same framework as the reported host lattice, hexagonal BaCa2Y6O12. However, the structure between the Ba and Ca atoms was partially disordered, and the site symmetry for the Ba site decreased from the 2a and 2b Wyckoff positions to 4e. The phosphor shows a reddish-yellow colour emission with a broad-band spectrum under blue-light irradiation at 460 nm. The emission spectrum was composed of four Gaussian bands, indicating Ce3+ is incorporated into two different sites, Ca2+-dominant and Y3+ sites, and this could be estimated using an empirical equation for determining the emission wavelength from crystallographic data and chemical compositions. Additionally, based on the observation of the particle morphology, the measurement of Ce3+ concentration and the thermal dependence of the luminescence intensity and luminescence lifetime property, BaCa2Y6O12:Ce3+ has high potential as a fundamental material. Crystal-field analysis based on the refinement of the crystal structure revealed the luminescence mechanism. The present work includes unique results on a distinct material design concept for a red-emitting oxide phosphor, which should have great significance for future phosphor material development. (C) 2019 Published by Elsevier B.V.

DOI： 10.1016/j.jallcom.2019.05.155

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Titanate nanotubes containing copper ions are interesting materials that exhibit efficient activity in the selective reduction of nitrogen monoxide and/or in the degradation of dyes. However, research seems to be less concerned about the interaction of these materials with various gas molecules. We investigated the room temperature adsorption of propene and propane onto the copper ion distributed on the titanate nanotubes (Cu2+-T-TiO2). From the adsorption experiments utilizing carbon monoxide, it was apparent that monovalent copper ions are formed in the titanate nanotubes by evacuation at around 473 K. Cu2+-T-TiO2 exhibited more efficient adsorption for propene, in comparison with propane. Fourier transform infrared spectroscopy clearly indicated the interaction of the monovalent copper ions in the titanate nanotubes with propene due to the pi back donation interaction between the active centers in the nanotubes and propene.

DOI： 10.1016/j.apsusc.2019.03.328

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Single crystal of novel orange-red emission CaAl2Si4N8:Eu2+ phosphor was grown by our original vapor phase technique, and the precise crystal structure was investigated for the first time by single crystal X-ray diffraction analysis. The crystal structure of CaAl2Si4N8:Eu2+ single crystal was verified to be an α-Si3N4-type trigonal structure (space group P31c) with a = 0.79525(9) nm, c = 0.57712(8) nm, and z = 2. The Ca atoms were coordinated to seven nitrogen atoms and located in the three-dimensional framework formed by (Al, Si)N4 tetrahedra. The single-crystal CaAl2Si4N8:Eu2+ phosphors exhibited a broad reddish-yellow emission with a peak at 600 nm under near-UV and blue light excitation. When increasing the temperature up to 150 °C, the emission intensity of the CaAl2Si4N8:Eu2+ phosphor decreased to 88% of the initial value at 25 °C.

DOI： 10.1021/acsomega.9b00606

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A green-emissive Ba2SiO4: Eu2+ nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 degrees C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba2SiO4 was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)(2).8H(2)O and amorphous SiO2. In addition, the results of X-ray powder diffraction gave evidence that the Ba2SiO4 phase was formed through a Ba-2[SiO2(OH)(2)](2) phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15-20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f(6)5d(1) -> 4f(7) transition of Eu2+ under the near UV excitation of 360 nm. The result indicates that Eu3+ is partly reduced to Eu2+ without using reduction gas. (C) 2019 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jallcom.2019.02.295

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

White LEDs based on near ultraviolet LED and red/green/blue phosphors have been attracted in terms of outstanding color rendering index. In particular, we focus on the blue emitting phosphors because the commercial BaMgAl10O17:Eu2+ needs high temperature in order to be obtained. In this study, we succeeded in synthesizing Eu2+-activated Na2Mg2Si6O15 phosphors as a single phase by the conventional solid state reaction. Eu2+-doped Na2Mg2Si6O15 phosphors showed the broad blue emission from 400-550 nm due to the 4f-5d allowed transition of Eu2+ under the ultraviolet light excitation. Moreover, the emission intensity of Eu2+-activated Na2Mg2Si6O15 phosphor at high temperature kept about 85% at 423 K, which indicated the thermal stability of Na2Mg2Si6O15:Eu2+ was extremely higher than that of other Eu2+-activated silicate phosphors. Thus, Eu2+-activated Na2Mg2Si6O15 phosphor is able to become the novel luminescent material for White LED based on the near-ultraviolet LED.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

The Al doped Sr2Si5N8:Eu2+ single crystal Sr2AlxSi5-xOxN8-x:Eu2+ (x approximate to 0.7) were grown by our original single crystal growth method and the precise crystal structure was investigated by single crystal X-ray diffraction analysis for the first time. O atoms are partially substituted for only N1 and N5 sites which are connected with the Si/Al atoms to compensate the "Pauling's second rule", which indicates the introduction of Al atoms for Si sites restricts the N sites that can be substituted by O atoms. The Sr2AlxSi5-xOxN8-x:Eu2+ (x approximate to 0.7) phosphors show the change of site selectivity of Eu for Sr sites, which causes the red-shifted emission spectrum of Sr2AlxSi5-xOxN8-x:Eu2+ (x approximate to 0.7) than that of Sr2Si5N8:Eu2+. (C) 2019 The Japan Society of Applied Physics

DOI： 10.7567/1347-4065/ab0c74

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

New green-emitting Sr4ScAl3O10:Eu2+ phosphor was prepared using a novel melt quenching synthesis method. The temperature of raw materials irradiated with the strong light of the Xe arc-lamp was rose up to about 2273 K, followed by a sharp drop in the temperature after turn off the lamp. This method is a useful tool for rapid screening of novel phosphor materials.

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Tubular titanates (T-TiO2) are interesting materials considering their large specific surface area and ability for cationic substitution in the tubes. In this study, we systematically examined the alkali-metal ion-exchange features of T-TiO2 and clarified their CO2 adsorption properties at room temperature in details. Assuming the resulting ion exchange was affected by hydration, T-TiO2 ion-exchange samples exhibited more intense exchange levels with an increasing alkali-metal ionic radius. Furthermore, the alkali metal ions exchanged were confirmed from the EDS maps to be uniformly distributed in the samples. CO2 adsorption capabilities were found to decrease with increasing the ionic radius of the alkali-metal ions exchanged. We rationalized the electrostatic forces between CO2 and the alkali-metal ion-exchanged titanate nanotubes as the dominant driving force.

DOI： 10.1021/acs.iecr.8b05662

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A multicolor emission phosphor can become a new luminescent material for emitting devices such as LEDs. However, most multicolor emission phosphors require two or more luminescent ions, such as Eu2+/Mn2+ and Eu2+/Tb3+/Mn2+. In this study, novel multicolor phosphor materials Li3NaSiO4:Eu2+ were successfully synthesized using a conventional solid-state reaction. The phosphors showed a unique white color with multicolored blue and yellow emissions under a near-ultraviolet light at 360 nm. Based on this result, there seems to be strong evidence that Eu2+ ions are substituted for two cation sites, NaO(6 )and LiO5. Moreover, Eu2+-doped Li3NaSiO4 phosphors exhibit excellent thermal stability in comparison with Eu2+-activated silicate phosphors owing to the presence of electron traps, which can be activated at high temperatures. (C) 2018 Published by Elsevier B.V.

DOI： 10.1016/j.jallcom.2018.10.299

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Polytetrafluoroethylene (PTFE), composed of fluorine and carbon atoms, has a potential to produce carbon-coated fluorides in the calcination of inorganic compounds. We synthesized high voltage cathode material for Na ion secondary battery, Na2FePO4F, using PTFE as the carbon-coating and fluorine source. The Na2FePO4F carbon-coated by a thermal decomposition of PTFE showed high discharge capacity (64.4 mAh g(-1)) at the first cycle of galvanostatic cycling by the improvement of conductivity. (C) 2018 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.17230

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Lithium orthophosphate Li3PO4 nanoparticles were synthesized through a water assisted solid state reaction (WASSR) method. The nanoparticles obtained in this study adopt a stable orthorhombic structure (beta-type), which is a low temperature phase, in a single phase with high crystallinity. The Li3PO4 nanoparticles have a granular particle morphology and the particle size is less than 50 nm.

DOI： 10.1166/sam.2018.2844

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Rare earth free RbVO3 ceramic materials were prepared by facile solid-solid contact reaction between Rb2CO3 and V2O5 powders at room temperature within few minutes. Synchrotron X-ray power diffraction analysis and energy dispersive X-ray spectroscopy study showed that the resultant nanoparticles are crystalline with almost 100% purity. Further, the as-prepared sample showed emission spectrum intensity at 530 nm implying that RbVO3 ceramic materials can be used for white LED application. In addition, when 0.01 M aqueous NH4OH was added to the mixture of Rb2CO3 and V2O5, the emission intensity of the product was about twice higher than that of the product obtained from the reaction in moist air. The luminescence internal quantum efficiency (QE) of as-prepared RbVO3 phosphor is about 35% as estimated by a direct method. The present room-temperature fabrication method has great potential in large-scale fabrication of phosphor materials as well as other composite functional materials due to significantly reduced reaction time and energy. (C) 2018 The Electrochemical Society.

DOI： 10.1149/2.0201806jss

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS INC  

Ceramic materials have been widely used in various applications and are significantly important in our daily life. The various methods for synthesizing ceramics powder materials have been already reported, and the synthesis method is known to considerably affect the characteristics and particle morphology of ceramic powder materials. We have recently developed a novel soft chemical synthesis method, named water-assisted solid-state reaction (WASSR) method, which can be synthesized at low temperatures below 100 degrees C. We further demonstrated the effect and availability of this method on the synthesis process for ceramic oxide materials. In this paper, we review some results for the nanophosphors synthesized by the WASSR method and discuss the reaction mechanism of this method.

DOI： 10.1080/05704928.2017.1390344

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© 2018 Trans Tech Publications, Switzerland. We report synthesis of nano-sized oxide materials using a novel water assisted solid state reaction (WASSR) method. This novel soft chemical synthesis method is very simple and can synthesize nanoparticle materials just by storing or mixing raw materials added a small amount (typically 10wt%) of water in a reactor at low temperature below 373 K. Combinations of raw materials have a significant influence on the reaction rate.

DOI： 10.4028/www.scientific.net/KEM.777.163

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Magnesium metavanadate dihydrate (MgV2O6.2H(2)O) was synthesized as a nanophosphor by a water assisted solid-state reaction (WASSR) method, and its crystal structure and luminescence properties were investigated in detail. MgV2O6.2H(2)O has an orthorhombic structure with space group Pnma. In the crystal structure, the MgO6 octahedra and VO4 tetrahedra formed a layered structure in the direction of the b axis, and the VO4 tetrahedra formed a chain structure along the a axis. The nanophosphor showed broad and strong optical absorption in the near-ultraviolet region and exhibited a broad yellow emission peak at 563 nm. (C) 2017 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.dyepig.2017.06.024

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LiCoPO4-carbon composites (LiCoPO4/C) were synthesized via a solid state reaction with a new furnace black, CB1, which was developed by Asahi Carbon Co., Ltd. The CB1 used here has superiority physico-chemical properties, e.g., ultrafine particle sizes, high specific surface areas, and high "structure", the degree of linkage among carbon particles. The particle growth of LiCoPO4 was suppressed by the addition of CB1 to the LiCoPO4 precursors and then followed by calcination. CB1 was dispersed among LiCoPO4/C particles successfully to form conductive paths. Consequently, a high electrochemical capacity was achieved in aid of the presence of CB1. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.85.643

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

Most conventional white light emitting diodes (white-LEDs) that are widely used as a new lighting system in next generation lights with Y3Al5O12: Ce3+ (YAG: Ce3+)-based phosphors have a low colour rendering index (CRI) because the YAG: Ce3+ phosphor shows a weak emission intensity in the red spectral region. Therefore, discovering a red-emitting phosphor with a high-efficiency is quite important to enhance the CRI of white-LEDs. In this study, we successfully discovered a novel, red-emitting Ce3+-activated Sr3Sc4O9 phosphor that can be excited by blue-light irradiation at 425 nm. A crystal structure of the host material was first determined by Rietveld refinement, which indicated that it should be isostructural with Ba(3)Ln(4)O(9) (Ln = Sc, Y and Dy-Lu). As the Ce3+ content increased, the X-ray diffraction patterns shifted to a lower angle, which suggested that the Ce3+ ion could substitute Sc in the Sr3Sc4O9 host. Under UV and blue-light excitation, the Ce3+-activated Sr3Sc4O9 phosphor exhibited a broad emission band with a maximum peak at 620 nm, and its full width half maximum (FWHM) was 180 nm (4530 cm(-1)). The highest emission intensity was obtained for Sr-3(Sc0.997Ce0.003)(4)O-9, and the internal quantum efficiency of this phosphor under excitation at 425 nm was 53%. To the best of our knowledge, the emission band of the Ce3+-activated Sr3Sc4O9 phosphor is the longest wavelength for a reported Ce3+-activated oxide phosphor.

DOI： 10.1039/c7tc03203j

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

We here prepared polystyrene-derived carbon-coated Na3V2(PO4)(3) composite (NVP/C) cathode materials via a solid-phase reaction using a mixture of NVP precursor and polystyrene (as the carbon source), followed by calcination at high temperatures. Using this method, we were able to obtain active NVP materials with relatively high purity while allowing a uniform surface coating with carbon layers about 3-4 nm thick. This structure significantly prevented NVP particle growth even after calcination at high temperatures. The NVP/C material calcined at 700 degrees C exhibited the best charge-discharge performance among the samples studied. (C) 2017 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.16266

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Rb3V5O14, which was successfully synthesized by a water assisted solid state reaction (WASSR) method, is a fluorescent red pigment that is environmentally friendly. The Rb3V5O14 fluorescent pigment showed a strong optical absorption in the green light region due to the energy transfer from O2- 2p orbital to V5+ 3d orbital of VO5 polyhedra and band-gap energy of Rb3V5O14 was 2.02 eV. The fluorescent pigment presented a broad red emission peaked at 625 nm due to the T-3(2) -> (1)A(1) and T-3(1) -> (1)A(1) transitions of the [VO4](3-) group. The Rb3V5O14 fluorescent pigment showed a bright-vivid red body color, and the L*, a*, and b* values were 47.4, +45.9, and +34.4, respectively. (C) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.dyepig.2016.08.040

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Novel nontoxic LaAl1-xMnxGe2O7 (0.01 <= x <= 0.20) violet pigments were synthesized through a conventional solid-state reaction. The crystal structures, optical properties, and color properties of these pigments were investigated. The LaAl1-xMnxGe2O7 (0.01 <= x <= 0.20) pigments prepared in the present study show excellent potential as environmentally friendly inorganic violet pigments. These pigments exhibit a strong optical absorption in the yellow-red light region due to the Mn3+ d-d transitions, which is the origin of the violet color. Among the obtained LaAl1-xMnxGe2O7 (0.01 <= x <= 0.20) pigments, LaAl0.90Mn0.10Ge2O7 showed the most vivid violet color and the L*, a*, and b* values are 50.8, 18.0, and -29.7, respectively, values greater than those of a commercial cobalt violet pigment (Co-3(PO4)(2); L* = 46, a* = 33, b* = 32). Because the LaAl0.90Mn0.10Ge2O7 pigment is composed of nontoxic elements, this pigment can be an effective alternative to currently used commercial violet pigments. (C) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.dyepig.2016.08.038

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A single-phase red-emitting NaEu(MoO4)(2) phosphor with nanosized particles was synthesized using a water-assisted solid state reaction (WASSR) method, a new low-temperature synthesis method developed by our group. NaEu(MoO4)(2) exhibits a monoclinic structure with a space group C2/c (no. 15), which is composed of a Na/EuO8 dodecahedron with the site occupancy of Na/Eu = 1 : 1 and an MoO4 tetrahedron. To enhance the emission intensity of the NaEu(MoO4)(2) phosphor, Gd3+ was doped into the Eu3+ sites and NaEu1-xGdx(MoO4)(2) (0 < x <= 0.50) samples were synthesized using the WASSR method. The emission intensity of the phosphors was successfully enhanced by increasing the Gd3+ content in the samples with 0 <= x <= 0.30, but was reduced with x > 0.30. This indicates that the optimum composition of the phosphor for achieving a high emission intensity that is similar to 3.8 times higher than that of the NaEu(MoO4)(2) (x = 0) phosphor is NaEu0.70Gd0.30(MoO4)(2). These phosphors exhibit a granular particle morphology with the particle size of the phosphor being similar to 200 nm.

DOI： 10.1039/c7ra01832k

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Single phase of orthorhombic Li2SiO3 was synthesized via a novel soft-chemical synthesis method, water assisted solid state reaction method at 343-353K for 60 min. The crystal structure of the samples was characterized by X-ray diffraction (XRD) analysis. The scanning electron microscope (SEM) observation revealed that the estimated size of the particles is 50-200 nm. The XRD patterns and SEM images were compared to those of samples by a conventional solid state method at 1173K for 4 h. (C) 2017 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.16325

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© 2017 Proceedings of the International Display Workshops. All rights reserved. We reported novel soft chemistry for the preparation of nanophosphors. Novel water assisted solid state reaction (WASSR) method is very simple andean synthesize many ceramic materials just by storing or mixing of raw materials added a small amount of water in a reactor at low temperature.

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© 2017 Trans Tech Publications, Switzerland. Well-grown M3MgSi2O8 (M = Ca, Sr and Ba):Eu2+ phosphors were synthesized by novel melt quenching synthesis method. The luminescence property of the Sr3MgSi2O8:Eu2+ phosphor synthesized by the melt synthesis method is comparable to those of the sample synthesized by a conventional solid state reaction. Sintered phosphor balls with excellent luminescent characteristics were obtained.

DOI： 10.4028/www.scientific.net/MSF.883.17

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© 2017 Trans Tech Publications, Switzerland. We report a novel soft chemical synthesis method, water assisted solid state reaction (WASSR) method. This method is very simple and can synthesize many ceramic materials just by storing or mixing raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, well-crystalline SrMoO4 was obtained using the WASSR method.

DOI： 10.4028/www.scientific.net/KEM.751.353

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHEMICAL SOC JAPAN  

We employed an oxygen-pressure method as a novel approach to improve the emission intensity of a Ca14Zn6Al10O35:Mn4+ phosphor. With this new approach, the Ca14Zn6Al10O35:Mn4+ phosphor exhibited near-infrared emission under excitation at 450 rim, and the emission intensity of a Caw Zn-6(Al0.97Mn0.03)(10)O-35 phosphor was effectively enhanced by approximately 143% compared with that of a Ca14Zn6(Al0.97Mn0.03)(10)O-35 phosphor synthesized by a conventional solid-state reaction method in air.

DOI： 10.1246/cl.160498

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

A high intensity bluish-white emitting Ba2TiP2O9 phosphor was synthesized by a conventional solid-state reaction method and the precise crystal structure was investigated for the first time by Rietveld refinement analysis. Ba2TiP2O9 has a monoclinic crystal structure with a space group C2/c (no. 15), which is built out of PO4 tetrahedra and TiO5 pyramidal polyhedra connected to form a chain structure along the c-axis. The emission of Ba2TiP2O9 is due to a charge transfer transition between Ti(4+)-O(2-) in the pyramidal TiO5. The obtained Ba2TiP2O9 was excited efficiently by UV and VUV and displayed a bright bluish-white luminescence.

DOI： 10.1039/c6dt01715k

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

The lanthanum oxysulfide phosphor La2O2S:Tb3+ is generally synthesized by the direct sulfidation of La2O3 using H2S or CS2 gas. However, these gases are known to be highly toxic to humans. In this paper, a new synthesis method that uses 0.6U(2)SO(4)-0.4Na(2)SO(4) as the flux is proposed for obtaining La2O2S:Tb3+ phosphor, without the need for H2S or CS2 gas. The proposed method consists of two steps: 1) oxidation to obtain La2O2SO4 and 2) reduction to reduce La2O2SO4 to La2O2S. Using this novel method, (La1-xTbx)(2)O2S (0.01 <x < 0.13) were successfully synthesized in a single-phase form. The synthesized phosphors exhibited extraordinary luminescence behavior. Further, despite their low Tb3+ ion content, the phosphors showed high emission intensities. The relative emission intensity of (La0.95Tb0.05)(2)O2S (lambda(ex) = 270 nm) was 132% that of the commercial green-emitting phosphor (La0.52Ce0.31Tb0.17)PO4 (lambda(ex) = 285 nm), which shows the highest excitation absorption. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

DOI： 10.1016/j.ceramint.2016.03.176

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

Eu2+-doped Rb2Ba3P4O14 phosphors were synthesized in a single phase form by a conventional solid state reaction method and their optical properties were characterized. These phosphors showed broad optical absorption bands that can cover the UV and near-UV region, and exhibited a narrow deep-blue emission and broad reddish-yellow emission with peaks at 423 nm and 550 nm, respectively. The highest reddish-yellow emission intensity was obtained for Rb-2(Ba0.99Eu0.01)(3)P4O14.

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Publishing type：Part of collection (book)  

© Springer-Verlag Berlin Heidelberg 2017. In white-LED application, the development of novel phosphors with high luminescence efficiency and high-emission color purity is extremely important because the performance of white LEDs is directly affected by the luminescence properties of the phosphors. In this chapter, therefore, we review some Eu2+- and Ce3+-activated phosphor materials and discuss the luminescence properties of these phosphors from the viewpoint of the relationship between the emission-band position and the crystallographic environment including the local site symmetry of the dopant site in the host lattice. We also propose a material-design concept to develop long wavelength-emission phosphors.

DOI： 10.1007/978-3-662-52771-9_7

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Publishing type：Research paper (international conference proceedings)  

© 2016 Trans Tech Publications, Switzerland. We report novel soft chemical synthesis method, solid hydratethermal reaction (SHR) method as a new soft chemistry. This method is very simple and can synthesize the ceramic materials just by storing the mixture of raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, Nano-size YVO4 (under 100 nm in diameter) was obtained using the SHR method.

DOI： 10.4028/www.scientific.net/KEM.690.268

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC JAPAN  

Ti-doped lithium vanadium(III) phosphate cathode materials, Li3-2x(V1-xTix)(2)(PO4)(3), were prepared by a solid state reaction. The Ti-doped samples exhibited that the gamma-phase is stabilized at room temperature by substituting Ti for V sites at more than x = 0.10. The discharge capacity of the doped samples at a 60C rate was found to be much higher than that for the non doped sample. This improved performance found for the doped cathodes was attributed to the increase in ionic conductivity given by the transition of alpha- to gamma-phase via Ti substitution. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.83.828

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC JAPAN  

A new type of carbon black CB1 was developed, by Asahi Carbon Co., Ltd., for usage of a lithium-ion battery (LIB). Compared with commercially available acetylene black, CB1 in which the network structure of carbon is developed has a relatively larger specific surface area. Therefore, CB1 dispersed in LiFePO4 precursors by planetary ball milling inhibited LiFePO4 primary particles' growth during calcination process. Charge/discharge performance was improved by coexistence of CB1 with polystyrene (PS) carbon layers deposited on LiFePO4 particle surfaces, compared to the performance for the LiFePO4 sample covered with carbon layers derived from only PS. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.83.858

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Blue-light excitable, green-light emitting Ba-3(Sc1-xHox)(4)O-9 phosphors were successfully synthesized in the single-phase form by a melt synthesis method for the first time. These phosphors show sharp green light emission under blue light (455 nm) excitation. The principal green light emission peak observed at 555 nm corresponds to the transition from F-5(4) and S-5(2) to the I-5(8) energy level of Ho3+. (C) 2015 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.123.880

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER SCIENTIFIC PUBLISHERS  

Yttrium orthovanadate, YVO4 was prepared using a novel water assisted room temperature solid state reaction method, consisting of simply mixing of Y2O3 and V2O5 at room temperature with the addition of a small amount of water. Nano-scale spherical particles of YVO4 approximately 10-100 nm in diameter were obtained.

DOI： 10.1166/sam.2015.2364

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Novel Ln(3+)-doped (Ln(3+) = Tb3+ and Eu3+) and Eu3+, Bi3+ co-doped Ca3Y3Ge2BO13 phosphors were synthesized by a conventional solid-state reaction method. Tb3+- and Eu3+-doped phosphors showed strong narrow green and red emission due to 4f intra-shell transitions of the Tb3+ or Eu3+ ions under the excitation at 254 nm. Bi3+ co-doped Ca3Y3Ge2BO13:Eu3+ phosphor has a new broad strong excitation band appeared at around 302 nm due to S-1(0)-> P-3(1) transition of Bi3+, and presents red emission owing to 4f-4f transition of Eu3+ under excitation at 302 nm. (C)2015 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.123.507

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

The viscosities of unary, binary, and ternary eutectic alkali metal carbonate molten salts were measured for the first time by a rotation method using a high-temperature rheometer system and the reliability of the viscosity values was evaluated. The viscosity values obtained in this study are similar to that reported by Sato's research group, which is considered to have the highest reliability among the studies reported till date. The standard errors in the viscosity values at each temperature are less than +/- 5%. (C) 2015 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.123.355

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

New green-emitting KBa1-xScSi3O9:Eu-x(2+) phosphors for white LEDs were synthesized by a conventional solid-state reaction method. The obtained KBa1_xScSi3O9:Eu-x(2+) phosphors show the strong broad optical absorption band from UV to blue light region and exhibit broad green emission with a peak at 521 nm under excitation at 405 nm due to the allowed 4f(6)5d(1)-4f(7) transition of Eu2+. Optimization of Eu2+ concentration resulted in the highest green emission peak intensity was obtained at the composition of KBa0.94ScSi3O9:Eu-0.06(2+), and the relative emission intensity of this phosphor was 32% of that of a commercial YAG:Ce3+ phosphor. (C) 2014 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.optmat.2014.10.003

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

New HEu1-xGdx(MoO4)(2) nanophosphors were synthesized by a simple one-step ion-exchange method. These nanophosphors have rod-like particle morphology with 0.5-15 mu m in length and outer diameters in the range of 50-500 nm. By optimization of the composition, the highest emission intensity was obtained for the samples with x = 0.50 for both KEu1-xGdx(MoO4)(2) and HEu1-xGdx(MoO4)(2).

DOI： 10.1587/transele.E97.C.1063

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Other Link： https://dblp.uni-trier.de/db/journals/ieicet/ieicet97c.html#WatanabeUKTS14

Language：English   Publishing type：Research paper (scientific journal)   Publisher：OPTICAL SOC AMER  

Novel Sr-6(Y1-xCex)(2)Al4O15 (0.005 <= x <= 0.20) phosphors were synthesized in a single phase form by a conventional solid-state reaction method. These phosphors can be achieved the emission color tunable from blue to orange-red by controlling the Ce3+ doping site in the Sr6Y2Al4O15 lattice and exhibit orange-red emission centered on 600 nm by blue light irradiation as the Ce3+ concentration was increased. To the best of our knowledge, this is the first report of Ce3+ doping oxide phosphor exhibiting orange-red emission centered on 600 nm under blue light excitation. (C) 2014 Optical Society of America

DOI： 10.1364/OME.4.001770

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHEMICAL SOC JAPAN  

This study investigated the luminescence properties of novel deep red phosphors Ca14Zn6M10O35:Mn4+ (M = Al3+ and Ga3+). These phosphors efficiently excited using a blue LED light. It exhibited a deep red emission around 713 nm. The luminescence intensities of CZA:Mn-0.03 and CZG:Mn-0.03 excited at 450 nm were, respectively, about 2.2 and 2.7 times higher than that of YAG:Ce3+ (P46). These phosphors also show little temperature quenching, but more than that shown by YAG:Ce3+ at 423 K. These results show that the deep red phosphor Ca14Zn6M10O35:Mn4+ (M = Al3+ and Ga3+) is a beneficial phosphor for use in indoor plant cultivation.

DOI： 10.1246/cl.140227

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHEMICAL SOC JAPAN  

Novel reddish yellow-emitting Ba-3(Sc1-xCex)(4)O-9 (0 <= x <= 0.01) phosphors were synthesized in a single-phase form by a conventional solid-state reaction method. These phosphors exhibited excellent optical absorption in the blue-light region and showed reddish yellow emission with a peak at 583 urn due to the 5d -> 4f transition of Ce3+ under excitation at 437 nm. By optimizing the Ce3+ concentration, the maximum emission intensity was obtained for Ba-3(Sc0.999Ce0.001)(4)O-9.

DOI： 10.1246/cl.140070

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

A fluoride electrode material for lithium-ion batteries, FeF3, was synthesized by a novel solid-state reaction method using polytetrafluoroethylene (PTFE) as a fluoride source instead of HF. FeF3 was obtained as the main phase according to the XRD patterns of the samples prepared in the present study. Furthermore, the synthesized FeF3 particles were nanosize. The initial discharge and charge capacities of the FeF3 sample were 387 and 293mAh/g, respectively, in the 4.5-1.0V region. (C) 2014 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.122.473

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Eu2+-activated Rb-Ba-Sc-Si-O glass phosphor was synthesized by a melt synthesis technique using arc-imaging furnace and their photoluminescence properties were characterized. In addition, the obtained glass phosphors annealed in a flow of 5%H-2-95% Ar gas to enhance the luminescent efficiency. The emission spectra of the Eu2+-activated glass phosphors presents yellow emission band centered at 537nm due to the 4f(6)5d(1) -> 4f(7) transition of Eu2+, and the emission intensity was effectively enhanced by the annealing treatment. (C) 2014 The Ceramic Society of Japan. All rights reserved.

DOI： 10.2109/jcersj2.122.452

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

A yellow-emitting silicate phosphor, NaAlSiO4 : Eu2+, was synthesized through a new reducing technique, using SiO powder as a silica source, during the preparation process. The addition of SiO powder as a silica source significantly enhanced the Eu2+ content, which led to an increase in the photoluminescence emission intensity of the NaAlSiO4 : Eu2+ phosphor. The optimization of the composition resulted in obtaining the maximum emission intensity for NaAlSiO4 : 7 mol% Eu2+.

DOI： 10.1080/15980316.2014.886628

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

Rare earth-free white emitting (Sr,Sn)(Zn,Mn)P2O7 phosphors were synthesized in a single phase form by a conventional solid-state reaction method and photoluminescent properties were characterized. These phosphors showed three broad band in emission spectra at 340, 440, and 690 nm, and the ratio of emission intensity between blue-green light and red light changes with Mn2+ content increasing because of energy transfer from Sn2+ to Mn2+. The emission color of the phosphors varied from blue-white to orange-white with the increase in the Mn2+ content and the emission color of the (Sr0.90Sn0.10)(Zn0.97Mn0.03)P2O7 phosphor was very close to white light.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

A novel bluish green-emitting silicate phosphor, RbBaScSi3O9 : Eu2+, was synthesized by a conventional solid state reaction method. The RbBaScSi3O9 : Eu2+ phosphor can be excited by a near-UV and blue light irradiation and presents a bluish green band centered at 500 nm due to the allowed transition from 4f(6)5d(1) to 4f(7) of Eu2+. The maximum emission peak intensity was obtained at the composition of RbBaScSi3O9 : 10 mol% Eu2+, and the emission intensity was 13% compared with that of the commercial YAG phosphor.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

The HEu(MoO4)(2) nanophosphor was synthesized for the first time by the H+-exchange of KEu(MoO4)(2). The nanophosphor obtained in the present study maintain the triclinic KEu(MoO4)(2) type structure in a single phase form with high crystallinity. The HEu(MoO4)(2) phosphor has rod-like particle morphology (length 0.5-20 mu m, diameter 50-400 nm). Both HEu(MoO4)(2) powder and solution shows red emission due to the 4f-4f transition of Eu3+.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

Blue-emitting (K1-xNax)Mg-4(PO4)(3):Eu2+ phosphors were synthesized through a conventional solid-state reaction method, and their photoluminescence properties were characterized. These phosphors exhibited the typical emission band assigned to the transition from 4f(6)5d(1) to 4f(7) of Eu2+, and the emission intensity was effectively enhanced by Na+-doping into the host lattice. The highest blue emission peak intensity was obtained for (K0.65Na0.35)Mg-4(PO4)(3):1 mol% Eu2+, where the relative emission peak intensity was 33% of that for the commercial blue-emitting BaMgAl10O17:10mol%Eu2+ phosphor. In addition, these phosphors have excellent thermal stability in the temperature quenching effect.

DOI： 10.1080/15980316.2014.907213

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER HEIDELBERG  

An ordered hierarchical meso/macroporous monoclinic bismuth vanadate (BiVO4) particle was fabricated for the first time by a simple two-step melamine template hydrothermal method followed by calcination. The physiochemical parameters of as-prepared porous materials were characterized by means of X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, Raman, Barrett-Emmett-Teller, and UV-vis techniques. The nitrogen adsorption-desorption measurement and pore size distribution curve suggest that meso/macropores exist in these hierarchical microarchitectures. Further, it is found that melamine plays a significant role in the formation of porous BiVO4 particles, and when a known amount of melamine was added, the surface area and pore size of such porous BiVO4 particles were increased. The photocatalytic activities of the as-prepared hierarchical BiVO4 samples were measured for the photodegradation of Congo red aqueous dye solution under visible light irradiation. Surprisingly, the porous BiVO4 particles showed outstanding photocatalytic activities than polycrystalline BiVO4 sample. The possible enhancement of such catalytic performance has also been further discussed.

DOI： 10.1007/s11356-013-1694-x

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

Rare-earth doped Ca2SnO4 phosphors were synthesized using a conventional solid state reaction method. The red phosphorescence of Eu(3+) was observed in this system with persistence time. In the as-prepared samples, the doped rare earth ions occupied both Ca and Sn sites in the host lattice. The longest phosphorescent persistence property can be achieved for the Ca2SnO4 phosphors with a 0.1% Eu dopant. Depending on the doped rare earth ions, afterglow emissions of various colors were observed.

DOI： 10.1039/c3dt33079f

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

Rare earth doped Na3AlP3O9N oxynitridophosphate phosphors were prepared by a conventional solid-state reaction method. The samples were sintered at 1073 K for 6 h in NH3 atmosphere. Eu doped samples show blue emission due to the 4f(6)5d(1) -> 4f(7) transition of Eu2+. When Eu concentration was 1 mol%, the emission intensity was the highest in Eu doped samples. The Tb-doped samples showed green emission at about 550 nm doe to the D-5(4) -> F-7(5) transition of Tb3+.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：KOREAN ASSOC CRYSTAL GROWTH, INC  

Eu-activated Mg-Y-Si-O-N glass and MgYSi2O5N phosphors were prepared by a conventional solid-state reaction method. The samples were sintered at 1573-1673 K for 2 h in NH3 atmosphere. MgYSi2O5N phosphors show red emission at 611 nm. On the other hand, emissions of Mg-Y-Si-O-N glass phosphors were shifted from blue (at about 450 nm) to yellow (at about 550 nm) with increasing concentration of Eu ions. The different luminescent characteristics between MgYSi2O5N and Mg-Y-Si-O-N glass are ascribed to different valence of doped Eu ions respectively.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC INC  

Certain silicate materials with different crystal structures show excellent luminescence properties. Furthermore, these silicate compounds have high chemical and thermal stability and considered as an excellent phosphor host materials. In this study, we report (Gd1-xEux)(3)BSi2O10 as a novel ultraviolet (UV) excited white phosphors prepared under solid state reaction and their luminescence properties at 393 nm excitation were investigated in detail. The as prepared (Gd1-xEux)(3)BSi2O10 phosphors showed red emission with UV (around 580-630 nm) and near-UV light (around 250-410 nm). The chromaticity coordinates (0.60, 0.34) of the prepared borosilicate phosphor were very close to the NTSC standard value (0.67, 0.33) and its emission intensity was almost similar to commercial red phosphor Y2O2S:0.05Eu(3+). Further, as prepared (Gd1-xEux)(3)BSi2O10 material is considered to be an efficient red-emitting phosphor for UV based light emitting diodes (LED). (C) 2012 The Electrochemical Society.

DOI： 10.1149/2.007302jss

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC INC  

A novel red-emitting olivine-type NaMgPO4:Eu2+ phosphor was synthesized for the first time by the melt synthesis technique using arc-imaging furnace. The NaMgPO4:Eu2+ phosphor can be efficiently excited by blue light irradiation and presents red emission band centered at 628 nm due to the 4f(6)5d(1) -> 4f(7) transition of Eu2+. The highest emission peak intensity was obtained for NaMgPO4:2.5mol%Eu2+, and the internal quantum efficiency of this phosphor at the excitation wavelength of 450 nm was 81%. Furthermore, these phosphors show an excellent thermal stability on the temperature quenching effect. (C) 2013 The Electrochemical Society. All rights reserved.

DOI： 10.1149/2.004312ssl

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：INT UNION CRYSTALLOGRAPHY  

Crystals of dilithium manganese(II) silicate were grown under high-temperature hydro-thermal conditions in the system LiOH-MnO(2)-SiO(2). The title compound crystallizes in the β(II)-Li(3)PO(4) structure type. The coordination polyhedra of all cations are slightly distorted tetra-hedra (m symmetry for MnO(4) and SiO(4)), which are linked by corner-sharing to each other. The vertices of the tetra-hedra point to the same direction perpendicular to the distorted hexa-gonal close-packed (hcp) array of O atoms within which half of the tetra-hedral voids are occupied by cations. In comparison with the previous refinement from powder X-ray data [Dominko et al. (2006 ▶). Electrochem. Commun.8, 217-222], the present reinvestigation from single-crystal X-ray data allows a more precise determination of the distribution of the Li(+) and Mn(2+) cations, giving a perfectly site-ordered structure model for both Li(+) and Mn(2+).

DOI： 10.1107/S1600536812035040

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

Well-crystallized Ba2SiO4:Eu2+ powders were grown on a substrate by the vapor phase reaction between a mixed powder (barium carbonate and europium oxide) and SiO gas. The vaporization of SiO occurs at 1400-1600 degrees C from the SiO2 source (or SiO powder) in a reducing atmosphere. The formed SiO gas was transported by 95 vol% Ar - 5 vol% H-2 gas and reacted with the raw material powders. The emission intensity of the Ba2SiO4:Eu2+ phosphor synthesized by the new vapor phase technique is about 2.6 times higher than that of a conventional solid-state reaction sample.

DOI： 10.1587/transele.E94.C.1745

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Other Link： https://dblp.uni-trier.de/db/journals/ieicet/ieicet94c.html#IshigakiTSUS11

Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

We have applied a novel 'melt synthesis technique' rather than a conventional solid-state reaction to rapidly synthesize phosphor materials. During a synthesis, the mixture of oxides or their precursors is melted by light pulses (10-60 s) in an arc-imaging furnace on a water-cooled copper hearth to form a globule of 1-5 mm diameter, which is then rapidly cooled by turning off the light. Using this method, we synthesized several phosphor compounds including Y3Al5O12:Ce(YAG) and SrAl2O4:Eu,Dy. Complex phosphor oxides are difficult to produce by conventional solid-state reaction techniques because of the slow reaction rates among solid oxides; as a result, the oxides form homogeneous compounds or solid solutions. On the other hand, melt reactions are very fast (10-60 s) and result in homogeneous compounds owing to rapid diffusion and mixing in the liquid phase. Therefore, melt synthesis techniques are suitable for preparing multi component homogeneous compounds and solid solutions.

DOI： 10.1088/1468-6996/12/5/054205

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

Anatase TiO2 having high temperature stability and specific surface area was synthesized using a gel precursor in very mild conditions. The precursor gel was obtained by dialysis treatment of Na16Ti10O28-HNO3 solution. The samples were characterized by X-ray diffraction analysis, transmission electronmicroscopy, Brunner-Emmett-Teller method for specific surface area measurements, and thermogravimetric analysis.

DOI： 10.4028/www.scientific.net/KEM.485.279

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

We succeeded in the single crystal growth of Ba2SiO4:Eu2+ by novel synthesis method which was gas (SiO) and solid (Ba - Sc - Al - Eu - 0) phase hybridized. The Ba2SiO4:Eu2+ single crystal was synthesized by interfacial crystal growth after the reaction of the SiO gas with the surface of Ba - Sc - Al - Eu - O substrate in the reductive atmosphere. The single crystals were plate-like crystals with about 500 mu m sizes and emitted green light around 500 nm under 300 - 450 nm excitation.

DOI： 10.4028/www.scientific.net/KEM.485.325

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：WILEY-V C H VERLAG GMBH  

Perovskite-related compounds have been investigated in many fields, because they have various unique properties due to their compositions and structures which are characterized by various combinations of the A and B cations. In addition, defect perovskite-type compounds have also been investigated in many areas, especially as ion conductors. In this study, we used the A-site and oxygen-deficient perovskite, Sr3Al2O6, as a photoluminescent host material. This means that the defect sites were able to substitute several ions. We investigated the A(3)Al(2)O(6):Eu2+ phosphor material (A = Mg, Ca, Sr, Ba) produced by a solid state reaction in several kinds of atmospheres. Based on our results, the phosphor showed wide excitation and emission bands of 300-400 nm and 450-600 nm, respectively. The emission color control depended on the A-site substitution ratio. It is a very useful phosphor for white LEDs. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

DOI： 10.1002/pssc.201084140

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

As described herein, we prepared SrAl2O4:Eu2+, Dy3+ phosphor using a domestic microwave oven operated at 2.45 GHz with 500 Win 30 min, processes with carbon reduction. Using carbon as the microwave absorber it generates thermal energy. Furthermore, heating with carbon can provide a reductive atmosphere. Prepared samples emitted phosphorescence emission for a long time. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.mseb.2009.11.004

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Luminescence property of a new phosphate phosphor, RbPO3:Tb, is reported in this paper. A single phase sample was obtained by thermal decomposition of a raw material mixture (RbH2PO4 and Tb4O7) at 973 K. The phosphor could be efficiently exited by the UV light, yielding an intense green emission around 550 nm. The intense green emission is originated from the f-f transition of Tb3+ ion. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.mseb.2009.12.025

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

To synthesize various complex oxide materials and their solid solutions, we applied a novel "melt-synthesis technique" rather than conventional solid-state reaction techniques. Rapid synthesis methods to develop those double oxides have been strongly anticipated. During melt synthesis, the mixture of oxides or their precursors is melted rapidly (1-60 s) in an arc-imaging furnace using strong light radiation. A spherical molten sample with multiple homogeneously mixed cations was solidified directly on a copper hearth with rapid cooling of ca. 10(2) degrees C/s.We studied the synthesis of A(2)BO(4) type double oxides (AA')(2)BO(4) (A= Sr(2+), Ca(2+), A' = La(3+), Gd(3+), Y(3+), Eu(3+), B=Al) using this method. Homogeneous samples with Eu(3+) dopants were synthesized using liquid phase mixing in a few seconds, which is much faster than diffusions of ions in solid phase. Red fluorescence under the irradiation of ultraviolet light (254 and 365 nm) was observed. The excitation band shifted. (C) 2009 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jeurceramsoc.2009.05.040

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

New red phosphors Na3YSi2O7:Eu3+ was prepared by a conventional solid-state reaction. This silicate phosphor can be efficiently excited by near UV light, yielding an intense red emission. Under the excitation of near UV light, the emission intensity is higher than that of a commercial red phosphor Y2O2S:Eu3+.

DOI： 10.4028/www.scientific.net/KEM.421-422.360

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

We report the synthesis and photocatalytic activity of CaZnGe2O6, which contains Ca2+ ions and one-dimensional GeO4 chains (Ge4+: d(10) electronic configuration). This sample demonstrated the water splitting phenomenon by loading with RuO2 cocatalysis. Moreover, Ln-doped CaZnGe2O6 (where Ln = La, Ce, Pr, Nd, or Sm) shows a higher photocatalytic activity than CaZnGe2O6.

DOI： 10.4028/www.scientific.net/KEM.445.187

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We synthesized Sr0.7La0.2[ ](0.1)Bi2Ta2O9 (SBTL, [ ] vacancy), and measured their photocatalytic activity for water decomposition under UV light irradiation after acid treatment. They showed the high photocatalytic activity under UV light irradiation (H-2 evolution (213 mu mol / h), O-2 evolution (82 mu mol / h)).

DOI： 10.4028/www.scientific.net/KEM.421-422.554

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Fine TiO2 particles were synthesized from titanate precursor, Na16Ti10O28, dissolved in aqueous HNO3 solution. Crystalline rutile TiO2 powders were prepared by reflux of dissolved powders in the aqueous HNO3 solution under 100 degrees C. Prepared TiO2 powders were characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy and BET specific surface area analysis.

DOI： 10.4028/www.scientific.net/KEM.421-422.498

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A white long persistence phosphor was synthesized in a single-phase of Mg2SnO4 which was synthesized by a solid-state reaction. This phosphor crystallized in an inverse spinel structure and showed a broad-band emission from 350nm to 700nm. The afterglow was observed upon the excitation by 254nm. A Li-doped Mg2SnO4 sample showed a higher photoluminescence intensity and a longer lifetime than the non-doped one.

DOI： 10.4028/www.scientific.net/KEM.421-422.352

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INST IMAGE INFORMATION & TELEVISION ENGINEERS  

beta-SrP2O6:Ce3+, Tb3+ phosphor was synthesized by solid state reaction in air condition. Ce and Tb could be easily reduced without reduction gases. The phosphor emit strong green light under UV excitation around 300 nm. Since reduced gases flowing isn't necessary, this process is convenient and easy technique for the phosphor materials.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INST IMAGE INFORMATION & TELEVISION ENGINEERS  

Well-crystalline Ba(2)Sia(4):Eu2+ powders were grown on a substrate by new vapor phase reaction between mixed powder (barium carbonate and europium oxide) and SiO gas. The vaporization of SiO was performed at 1400 - 1600 degrees C from the SiO2 source (or SiO powder) in reductive atmosphere. Formed SiO gas was transported by 95 vol% Ar- 5 vol% H-2 gas and reacted with raw material powders. The emission intensity of the Ba2SiO4:Eu2+ phosphor synthesized by new vapor phase technique is about 2.6 times higher than that of a conventional solid state reaction sample.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

Photocatalysts for overall water splitting have great potential in solar energy applications. A variety of photocatalysts have shown activity for water splitting. In particular, oxysulfides are the great interest because of their ability to generate H-2 and O-2 from water under visible light. However, they are generally synthesized under H2S flow, which is an extremely harmful gas for humans. In this study, La2O2S2 was synthesized at low temperature without H2S gas, and its photocatalytic activity was confirmed by hydrogen generation experiments.

DOI： 10.4028/www.scientific.net/KEM.445.217

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

Low-dimensional structure compounds as layered perovskite shows high photocatalytic activity in water splitting. In this study, we investigated that synthesis and characterization of photocatalytic activity of BaGeGa6O12 with a one-dimensional structure. BaGeGa6O12 with loading 0.3wt% RuO2 showed a photocatalytic activity for water splitting into H-2 (70.6 mu mol / h) and O-2(28.1 mu mol / h).

DOI： 10.4028/www.scientific.net/KEM.445.191

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

Photochemical splitting of water into H-2 and O-2 using solar energy is process of great economic and environmental interest. In this study, we investigated novel photocatalytic compound, Na16Ti10O28, for water splitting. Na16Ti10O28 was prepared by solid-state reaction at 900 degrees C for 1 h. Prepared sample was characterized using powder X-ray diffraction, diffuse reflectance spectrum, and scanning electron microscopy. As-prepared Na16Ti10O28 sample is easily hydrated in water. Hydrous Na16Ti10O28 showed H-2 evolution without co-catalyst.

DOI： 10.4028/www.scientific.net/KEM.421-422.546

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Alkaline earth silicates. which comprise a host material doped with rare-earth minerals, show excellent luminescence properties with various crystal structures and high stability. From results of this study, we report luminescence properties of Ba(9)Sc(2)Si(6)O(24):Eu(2+) and Ba(9)Sc(2+delta)Si(6)O(24+3 delta)N(3 delta):Eu(2+) as a novel alkaline earth silicate and silicon oxynitride phosphors for white LEDs Using a conventional solid-state reaction, Ba(9)Sc(2)Si(6)O(24):Eu(2+) samples were synthesized and Ba(9)Sc(2+delta)Si(6)O(24+3 delta)N(3 delta):Eu(2+) samples were obtained by nutrization of Ba(9)Sc(2+delta)Si(6)O(24):Eu(2+) The samples can be excited by blue light, exhibiting green (Ba(9)Sc(2)Si(6)O(24):Eu(2+)) and yellow (Ba(9)Sc(2+delta)Si(6)O(24+3 delta)N(3 delta):Eu(2+)) efficiently, which are emissions for use in white LEDs essentially. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jlumin.2009.04.028

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

A series of coordination polymers constructed by sodium, lanthanide(III), and pyridine-2,6-dicarboxylate (dipic),NaLn(dipic)(2) center dot 7H(2)O (Ln = Eu, Gd, Tb), have been prepared under a hydrothermal condition. The crystal structures of the three compounds which are isostructual were determined by single-crystal X-ray diffraction. The two-dimensional layers found in the compounds are built up from six-folded {NaO6} polyhedra and nine-folded {LnN(2)O(7)} polyhedra, these being edge-shared each other along the c axis and bridged by carboxylate groups of dipic along the b axis, respectively. This two-dimensional framework provides cavities inside the layer and interlayer spaces outside the layer for accommodation of the two dipic molecules coordinated to a lanthanide(III) ions. The dehydrated materials obtained by heating the as-synthesized crystals at 200 degrees C held their crystal structure, and absorbed the same amounts of water molecules as those of the as-synthesized crystals upon the exposure of 100% relative humidity at room temperature. The Eu and Tb compounds showed strong red and green emissions, respectively, due to an energy transfer from dipic molecules to trivalent emission ions. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ica.2009.01.036

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

This paper represents the hydrothermal synthesis of new isomorphous lanthanide-vanadium complexes with one-dimensional coordination polymers: [Pr-2(VO2)(2)(dipic)(4)(H2O)(9)] center dot nH(2)O with dipic = pyridine-2,6-dicarboxylic acid and n = 7.75. The structure determination shows a unique one-dimensional structure in which three types of chains run along the c-axis: the chain of positively charged praseodymium complexes bridged by a dipic ligand ([Pr(dipic)(H2O)5](+)), the chain of negatively charged, stacked vanadium complexes ([VO2(dipic)](-)), and the chain of neutral praseodymium complexes with a bridged dipic ligand and a coordinating dipic ligand ([Pr(dipic)[VO2(dipic)](H2O)(4)]). Such one-dimensional chains provide open channels which can accommodate water molecules. Not only accommodated water molecules but also ones coordinated to praseodymium ions were easily removed and absorbed upon heating at 200 degrees C and exposure of humidity at room temperature, respectively. (C) 2009 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.poly.2009.01.010

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

A hybrid coordination complex, [(H5O2)(H(2)bpy)(bpy)(4)][NaMo8O26]center dot 2H(2)O (bpy = 4,4-bipyridine), was synthesized via hydrothermal reactions at 150 degrees C. The structure consists of two moieties; one is an infinite chain of beta-[Mo8O26] clusters, each of which is inter-linked up by a sodium ion, and the other a two-dimensional network constructed from doubly protonated bpy ions and its neutral molecules, which are linked with water molecules by hydrogen bonds. The stacking of the networks provides one-dimensional tunnels suitable for Na-beta-[Mo8O26] chains. (c) 2007 Published by Elsevier B.V.

DOI： 10.1016/j.ica.2007.07.040

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

To synthesize various complex oxide materials and their solid solutions, we have applied a novel "melt-synthesis technique" rather than conventional solid-state reaction techniques. The synthesis of well-crystalline multi-component phosphor materials is sometimes difficult using conventional solid-state reaction techniques because the reaction rates are slow as a result of slow mutual diffusion among solid-state species, thereby creating an inhomogeneous product. However, the melt reaction is rapid and homogeneous as it proceeds because of a solution reaction with fast diffusion. Red-phosphor La2WO6:Eu3+ samples with 25 mol% Eu3+ were prepared in a short time using melt synthesis. Red emission was observed at 618 nm typical for the Eu3+ center. Meltsynthesized samples exhibited much higher emission intensities than those obtained for the sample prepared using a solid-state reaction.

DOI： 10.1016/j.phpro.2009.07.045

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

We report synthesis of well-grown blue phosphor powder, CaMgSi2O6:EU2+, from new vapor phase method (Flash creation method) derived nanopowder precursor. Single phase phosphor sample was obtained by post-annealing at 1100 degrees C. Luminescence properties were compared with that of the sample synthesized by a conventional solid state reaction. The post-annealed sample showed intense blue emission under UV excitation.

DOI： 10.4028/www.scientific.net/KEM.388.107

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

The Eu2+-activated Sr2Mg3P4O15 (Sr2Mg3P4O15: Eu2+) phosphor is prepared using solid-state reactions of SrCO3, MgO, (NH4)(2)HPO4, and Eu2O3. The phosphor is excited efficiently by near-ultraviolet (n-UV) light irradiation, showing bright blue emission spectra at wavelengths of 400-550 nm with a maximum peak of 447 nm. The temperature dependence of luminescence intensity for (Sr0.94Eu0.06)(2)Mg3P4O15 is higher than that of commercial (Y, Gd)(3)Al5O12: Ce3+. In fact, Sr2Mg3P4O15: Eu2+ has high

DOI： 10.1016/j.phpro.2009.07.009

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：INT UNION CRYSTALLOGRAPHY  

The crystal structure of the title compound, {[NaSm(C7H3- NO4)(2)(H2O)(4)]center dot 3H(2)O}(n), was first reported by van Albada, Gorter & Reedijk [(1999), Polyhedron, 18, 1821-1824]. It has now been reinvestigated and confirmed from single-crystal data, giving greater understanding of the role of the water molecules. The two-dimensional layers found in the compound are built up from six-coordinate NaO6 polyhedra and nine-coordinate SmN2O7 polyhedra. The former share edges with each other along the c axis and the latter are bridged by carboxylate groups of pyridine-2,6-dicarboxylate anions along the b axis. Eight-membered rings of water molecules, connected to one another by hydrogen bonding, are formed in the interlayer spaces.

DOI： 10.1107/S160053680702884X

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

LiFePO4 has been synthesized using FeC2O4 center dot 2H(2)O, LiOH center dot H2O and NH4H2PO4 as raw materials by a temperature controllable microwave heating oven. The products were characterized by X-ray diffraction, scanning electron microscope and electrochemical methods. Measurement of dielectric properties of individual raw materials and products at a constant microwave frequency revealed that the starting mixture preheated at 320 degrees C as well as added acetylene black were well microwave absorbers. Single phase olivin-type LiFePO4 with uniform and fine particle sizes was successfully synthesized by microwave heating at 350 degrees C in 15 min. The LiFePO4 cathode materials thus obtained had a higher discharge capacity and better cycle performance than those of the LiFePO4 sample by a conventional solid-state reaction.

DOI： 10.2109/jcersj.115.450

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

Al-doped LiMn2O4 cathode materials synthesized by a newly developed wet-milling method and a dry process method using a conventional solid-state reaction were evaluated physicochemically and electrochemically. In the wet-milling method, a precursor was made from the raw materials atomized by a wet milling. A good cyclic performance was obtained for the LiMn2O4 samples prepared by the wet-milling method, achieved up to 99% of retention of capacity at 50 degrees C at the 30th cycle. The precursor obtained by the wet-milling method was well homogenous and highly reactive due to their finely ground particles, giving good crystallinity to LiMn2O4 products. (C) 2007 Published by Elsevier B.V.

DOI： 10.1016/j.jpowsour.2007.01.035

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

Reduced niobates, MLixCa2Nb3O10 (M = Rb, K and Na) and KNaxCa2Nb3O10 were synthesized by intercalation reaction with n-butyllithium or sodium azide. Rudd lesden-Popper type structure of sodium intercalation compound, KNaCa2Nb3O10, differ from that of the parent compound and lithium intercalation compound, KLiCa2Nb3O10. The magnetic susceptibility measurements showed that the sodium intercalation compound became superconductor with transition temperatures below 3.5 K. New lithium intercalation compound Na0.1Li0.8Ca2.45Nb3O10, for an ion exchange compound, Na0.1Ca2.45Nb3O10, with KCa2Nb3O10 type structure show the diamagnetic signals below 5 K.

DOI： 10.4028/www.scientific.net/KEM.350.163

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

We prepared low temperature phase of triple layered perovksite KCa2Nb3O10 by an ion-exchange reaction. Li-intercalated low temperature phase, Li0.79KCa2M3O10, shows strong diamagnetic signal around at 7.8 K. The magnetic phase transition temperature of Li-intercalated low temperature phase is higher than that of Li-intercalated high temperature phase.

DOI： 10.2109/jcersj.114.861

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

We focus on the development of new silicate phosphors for a white LED. In the europium doped silicate system, four LED phosphor candidates-Li2SrSiO4:Eu2+, Ba9Sc2Si6O24:Eu2+, Ca3Si2O7:Eu2+ and Ba2MgSi2O7:Eu2+ were found. Luminescent properties under near UV and visible excitation were investigated for the new Eu2+ doped LED silicate phosphors. These new phosphors have a relatively strong absorption band in a long wavelength region.

DOI： 10.1093/ietele/e89-c.10.1406

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Crystal structure of a layered perovskite, KCa2Nb3O10, was determined by the Rietveld refinement method for a powder neutron diffraction pattern. The compound crystallizes a monoclinic system with a space group P2(1)/m (No. 11) and lattice parameters of a = 0.77418 (6) urn, b = 0.77073 (6) urn, c = 1.4859 (1) run, beta = 97.51 (1)degrees.

DOI： 10.2109/jcersj.114.795

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

In order to purify waste water containing fluoride, the calcium additive method has usually been used to recover fluoride ions in the form of refractory calcium fluoride. In this case, the removable fluoride concentration is limited to be 10-15 mg/l due to the solubility of calcium fluoride. In this study, we report 3CaO.Al2O3.3CaSO(4). 32H(2)O (ettringite) as a highly absorbent substance for the fluoride. The fluoride concentration of the water treated with the ettringite was achieved to be less than 8 mg/l without sludge.

DOI： 10.2109/jcersj.114.729

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY  

An open-ended coaxial line probe for dielectric measurements at high temperatures was developed. The probe, which was fabricated using stainless steel as the center and outer conductors and quartz wool as an insulator, can function well up to 800 degrees C. The dielectric properties of the raw materials and resultant materials were measured using a network analyzer that was equipped with the open-ended coaxial line probe at high temperatures to clarify the formation reaction process of YVO4:Eu3+ and Mg2SnO4:Mn2+ phosphors using a microwave heating method. The developed probe was confirmed to be effective for reaction-process analyses at high temperatures.

DOI： 10.1111/j.1551-2916.2006.01074.x

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Tb -doped and (Ce , Tb )-codoped Ca Sr Al SiO were prepared using a solid-state reaction at 1273 K for 3 h in air and 1623 K for 6 h in a weakly reductive atmosphere of 5% H -95% N gas. The resultant (Ce , Tb )-codoped Ca Sr Al SiO phosphor shows four main emission peaks: one at 386 nm for Ce and three at 483, 542 and 591 nm for Tb . Emission intensity of Tb in the (Ce , Tb )-codoped phosphor was five times greater than that of the Tb single-doped phosphor because of the energy transfer from Ce to Tb . The codoped phosphor showed long-persistence white phosphorescence. © 2005 Elsevier B.V. All rights reserved. 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 0.5 1.5 2 7 2 2 0.5 1.5 2 7

DOI： 10.1016/j.jallcom.2005.01.132

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Plasma display panels (PDP) are most promising for large flat panel displays at present. However, luminescence efficiency and lifetime of PDP phosphors should be improved. Alkaline earth silicates show remarkable properties as phosphor hosts with various crystal structures and high chemical stability. Availability of Ba MgSi O has received attention as a host for vacuum ultraviolet (VUV) excitable phosphor. Blue-green phosphor Ba MgSi O :Eu with a high thermal quenching temperature [G. Blasse, W.L. Wanmaker, J.W. ter Vrugt, A. Bril, Philips. Res. Rep. 23 (1968) 189-200] exhibit high luminance (45% of commercial green VUV phosphor Zn SiO :Mn ) under VUV excitation without optimization of synthesis condition and emission color. Ba MgSi O is promising candidate for the new VUV phosphor in PDP and mercury-free lamp application. © 2005 Elsevier B.V. All rights reserved. 2 2 7 2 2 7 2 4 2 2 7 2+ 2+

DOI： 10.1016/j.jallcom.2005.01.070

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TRANS TECH PUBLICATIONS LTD  

Nanoparticles and thin films of potassium niobate KNbO3 were prepared using a unique solution reaction at room temperature. Precursor solutions and as-prepared samples were characterized by Raman spectroscopy. The data demonstrated that the niobate nanosheets consist of distorted Nb-O polyhedra.

DOI： 10.4028/www.scientific.net/KEM.320.7

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

Compositionally uniformed nitride powders (GaN and GaN-ZnO solid solution) were synthesized from metal oxide powders using a fluidized bed in a NH3 and/or a N-2 flow. GaN was synthesized by a two-step heating; the first step was done at 700 degrees C for 1 h, and the second step was done at 900 degrees C for 4h. A GaN-ZnO solid solution was synthesized at 900 degrees C for 4h. The synthesized nitride powders were characterized by powder X-ray diffraction (XRD). Optical properties of the products were examined by UV-Vis diffuse reflectance spectra. The grain size of the products was smaller than that of the starting materials. On the other hand, the crystallite size of the GaN-ZnO solid solution was almost the same as that of the starting material of Ga2O3.

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A-site deficient perovskite, Y (Ta W )O with was determined by the Rietveld refinement method from neutron diffraction data. Y Ta W O is an A-site ordered monoclinic symmetry. The space group of Y Ta W O is C2/c (No.15) and lattice parameters of a = 0.764(1) nm, b = 0.764(1) nm, c = 0.763(1) nm and β= 90.36°. 0.22 0.66 0.34 3 0.22 0.66 0.34 3 0.22 0.66 0.34 3

DOI： 10.4028/www.scientific.net/kem.269.11

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Language：Japanese   Publisher：日本電子材料技術協会  

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Language：Japanese   Publisher：島津評論編集部 ; 1940-  

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Language：Japanese   Publisher：Japan Synchrotron Radiation Research Institute  

DOI： 10.18957/rr.3.2.336

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Language：Japanese   Publisher：Japan Synchrotron Radiation Research Institute  

DOI： 10.18957/rr.1.2.77

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Language：Japanese   Publisher：The Japan Institute of Electronics Packaging  

DOI： 10.11486/ejisso.26.0_179

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Language：Japanese   Publisher：The Japan Institute of Electronics Packaging  

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Other Link： http://id.ndl.go.jp/bib/10539323

Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2010s.0.3l23.0

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DOI： 10.14853/pcersj.2009f.0.1po12.0

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DOI： 10.14853/pcersj.2009f.0.1po10.0

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DOI： 10.14853/pcersj.2009f.0.1po07.0

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DOI： 10.14853/pcersj.2009f.0.1po13.0

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DOI： 10.14853/pcersj.2009s.0.117.0

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DOI： 10.14853/pcersj.2009s.0.116.0

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DOI： 10.14853/pcersj.2008f.0.305.0

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DOI： 10.14853/pcersj.2008s.0.2p094.0

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DOI： 10.14853/pcersj.2008s.0.2p059.0

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DOI： 10.14853/pcersj.2008s.0.1i19.0

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DOI： 10.14853/pcersj.2008s.0.2p152.0

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DOI： 10.14853/pcersj.2008f.0.545.0

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DOI： 10.14853/pcersj.2008s.0.2p096.0

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DOI： 10.14853/pcersj.2008f.0.29.0

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DOI： 10.14853/pcersj.2008s.0.2p052.0

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DOI： 10.14853/pcersj.2008s.0.2p097.0

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DOI： 10.14853/pcersj.2008s.0.2p098.0

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DOI： 10.14853/pcersj.2008s.0.2p066.0

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DOI： 10.14853/pcersj.2008f.0.306.0

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DOI： 10.14853/pcersj.2008f.0.283.0

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DOI： 10.14853/pcersj.2008f.0.314.0

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DOI： 10.14853/pcersj.2008f.0.311.0

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DOI： 10.14853/pcersj.2008f.0.304.0

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DOI： 10.14853/pcersj.2008s.0.2p110.0

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DOI： 10.14853/pcersj.2008s.0.2p027.0

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DOI： 10.14853/pcersj.2008s.0.2p057.0

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Language：Japanese   Publisher：High Temperature Society of Japan  

BaMgAl<SUB>10</SUB>O<SUB>17</SUB>:Eu<SUP>2+</SUP> is a promising blue phosphor for lump, CRT and PDP. Conventionally, the BAM phosphors synthesize by the solid-state reaction from the mixture of oxide or carbonate starting materials. The solid-state reaction needs high temperature to get well-crystallized single phase. However, the control of particle morphology and size distribution is difficult for such a high temperature synthesis. In this study, we reported new synthetic technique using flash creation method derived nanopowder precursor. In the new technique, well-crystallized single phase phosphors were obtained at 1400°C for 6h. Although the powders were grown into the plate-like particles, the BAM powders retain the nano-size morphology after annealing. The emission intensity under UV excitation of Ba<SUB>0.9</SUB>Eu<SUB>0.1</SUB>MgAl<SUB>10</SUB>O<SUB>17</SUB> from the FCM-derived nanopowder was 110% compared with phosphors prepared by the conventional solid-state reaction. The excitation intensity under VUV (146nm) of the FCM derived nanopowder was 159% of the conventional solid-state reaction.

DOI： 10.7791/jhts.34.130

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Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2008f.0.312.0

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DOI： 10.14853/pcersj.2008f.0.259.0

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DOI： 10.14853/pcersj.2008s.0.2p058.0

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DOI： 10.14853/pcersj.2008s.0.2p065.0

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Language：Japanese   Publisher：リガク  

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Other Link： http://hdl.handle.net/10191/5215

Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2007f.0.708.0

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DOI： 10.14853/pcersj.2007f.0.691.0

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DOI： 10.14853/pcersj.2007f.0.692.0

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DOI： 10.14853/pcersj.2007f.0.683.0

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DOI： 10.14853/pcersj.2007f.0.710.0

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DOI： 10.14853/pcersj.2007f.0.706.0

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DOI： 10.14853/pcersj.2007f.0.704.0

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DOI： 10.14853/pcersj.2007f.0.694.0

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DOI： 10.14853/pcersj.2007f.0.690.0

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DOI： 10.14853/pcersj.2007f.0.705.0

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DOI： 10.14853/pcersj.2007f.0.693.0

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DOI： 10.14853/pcersj.2007f.0.273.0

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DOI： 10.14853/pcersj.2007f.0.703.0

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DOI： 10.14853/pcersj.2007s.0.586.0

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DOI： 10.14853/pcersj.2007f.0.689.0

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DOI： 10.14853/pcersj.2007f.0.278.0

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Language：Japanese   Publisher：The Ceramic Society of Japan  

We prepared low temperature phase of triple layered perovksite KCa₂Nb₃O₁₀ by an ion-exchange reaction. Li-intercalated low temperature phase, Li_0.79KCa₂Nb₃O₁₀, shows strong diamagnetic signal around at 7.8 K. The magnetic phase transition temperature of Li-intercalated low temperature phase is higher than that of Li-intercalated high temperature phase.<br>

DOI： 10.2109/jcersj.114.861

DOI： 10.1016/j.physb.2017.09.060_references_DOI_EGGTIU2JpJCXavLnVj8JNJxccZK

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Other Link： https://niigata-u.repo.nii.ac.jp/records/3585

Language：Japanese   Publisher：The Ceramic Society of Japan  

In order to purify waste water containing fluoride, the calcium additive method has usually been used to recover fluoride ions in the form of refractory calcium fluoride. In this case, the removable fluoride concentration is limited to be 10-15 mg/l due to the solubility of calcium fluoride. In this study, we report 3CaO•Al₂O₃•3CaSO₄•32H₂O (ettringite) as a highly absorbent substance for the fluoride. The fluoride concentration of the water treated with the ettringite was achieved to be less than 8 mg/l without sludge.<br>

DOI： 10.2109/jcersj.114.729

DOI： 10.1252/jcej.10we160_references_DOI_RLnQebpkdJVgWI9S7GWHWyEXMfX

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Language：Japanese   Publisher：The Ceramic Society of Japan  

The silica sand is primarily composed of high purity SiO₂. Mt. Iide over Niigata, Yamagata and Fukushima prefectures is known as a rich mine for silica sand. In this study, we adopted natural resource (silica sand from Mt. Iide, Osodani area) as a starting material for the synthesis of akermanite type long-persistent phosphor Sr₂MgSi₂O₇: Eu²⁺, Dy³⁺. The silica sand derived (Sr_0.98Eu_0.01Dy_0.01)₂MgSi₂O₇ showed long afterglow phenomena. Therefore, the silica sand can be potentially used in preparing silicate phosphors.<br>

DOI： 10.2109/jcersj.113.442

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Other Link： http://hdl.handle.net/10191/26491

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DOI： 10.14853/pcersj.2006f.0.207.0

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Other Link： http://hdl.handle.net/10191/1224

Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2006f.0.190.0

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DOI： 10.14853/pcersj.2006s.0.245.0

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DOI： 10.14853/pcersj.2006f.0.183.0

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DOI： 10.14853/pcersj.2006f.0.194.0

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DOI： 10.14853/pcersj.2006f.0.189.0

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DOI： 10.14853/pcersj.2006f.0.186.0

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DOI： 10.14853/pcersj.2006f.0.191.0

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DOI： 10.14853/pcersj.2006f.0.188.0

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DOI： 10.14853/pcersj.2006s.0.80.0

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DOI： 10.14853/pcersj.2006s.0.570.0

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Language：Japanese   Publisher：Japan Society of Sonochemistry  

At present, lithium cobalt oxides and lithium nickel oxides are mainly used as cathodes of lithium ion batteries. This is because these materials show very high battery performance. However, they are not suitable for large-scaled batteries such as hybrid vehicles, because they are expensive and poor in resources. We then focused on iron because it is cheaper and more abundant. Iron Phosphate (FeO_4) is one of the most interesting materials in Iron based materials so far because it shows a high discharge voltage of 3.5 volts. The theoretical capacity is 170mAh/g, which is sufficient enough compared to present materials being used as lithium ion batteries. The remarkable feature of FePO_4 is that it can be synthesized in air. Its treatment is very easy but the cycle performance shows poor. In this study, we have tried to obtain good cycle performance and improve discharge capacity of FePO_4 utilizing the sonochemical method. The sonochemical reaction was conducted under the irradiation of ultrasound power 200W and frequency 200kHz for 3hours. The crystalline phase was identified by powder X-ray diffraction. The cathode for the electrochemical characterization was made by mixing powders of the sample, acetylene black and PTFE in 70:25:5 weight ratio under Argon atmosphere. The cathode properties were measured in a galvanic cell with a nonaqueous electrolyte, a polypropylene separator and a Li metal anode. Charge/Discharge performances were evaluated at a current rate of 2C in the voltage range between 2 to 3.9 volts. The first discharge profile obtained for the sample heated at 700℃ is improved about 10% compared with a previous report's one. We could also obtain LiFePO_4 by the sonochemical method.

DOI： 10.20577/pamjss.15.0_13

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DOI： 10.14853/pcersj.2006f.0.475.0

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DOI： 10.14853/pcersj.2006f.0.416.0

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Language：English   Publisher：The Ceramic Society of Japan  

Crystal structure of a layered perovskite, KCa₂Nb₃O₁₀, was determined by the Rietveld refinement method for a powder neutron diffraction pattern. The compound crystallizes a monoclinic system with a space group <i>P</i>2₁/<i>m</i> (No. 11) and lattice parameters of <i>a</i>=0.77418(6) nm, <i>b</i>=0.77073(6) nm, <i>c</i>=1.4859(1) nm, β=97.51(1)°.<br>

DOI： 10.2109/jcersj.114.795

DOI： 10.2109/jcersj2.117.1161_references_DOI_M2YzFGKZfHyiCOzTUneDb1kXGvV

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Other Link： http://id.ndl.go.jp/bib/8087605

Language：Japanese   Publisher：Japan Society of Sonochemistry  

Iron is expected as a positive electrode material because of its large Clarke number. In this reason, we have been interesting in iron based materials and been studying. In this time we focused on Fe_3PO_7. The theoretical capacity as cathode is 777mAh/g. Its large capacity is very attractive to compare to present materials being used as lithium ion batteries (LiCoO_2: 274mAh/g, LiMn_2O_4: 148mAh/g). The literature shows that Fe_3PO_7 was prepared by the two-step solid-state reaction. At first stoichiometric amounts of Fe_2O_3 and (NH_4)_2HPO_4 powders are mixed and heated 950 degrees Celsius for 12hour to synthesize FePO_4. Fe_2O_3 and FePO_4 are mixed and preheated 950 degrees Celsius for 12hour and finally heated at 1050 degrees Celsius and finally Fe_3PO_7 is prepared. Fe_3PO_7 requires a lot of time and high sintered temperature. To improve these problems, we have been studying about an easily synthesis method of Fe_3PO_7. In this study, we used the sonochemical method and try to obtain Fe_3PO_7 by one step reaction.

DOI： 10.20577/pamjss.15.0_81

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DOI： 10.14853/pcersj.2006f.0.169.0

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DOI： 10.14853/pcersj.2006f.0.170.0

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DOI： 10.14853/pcersj.2006f.0.168.0

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Other Link： http://id.ndl.go.jp/bib/8535149

Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2006f.0.55.0

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Long persistent phosphor Sr₂MgSi₂O₇: Eu, Dy thin film was prepared by a sol-gel method. The phosphor showed bright blue-green long-lasting afterglow. The afterglow property of sol-gel derived sample was comparable to that of samples prepared by solid state reaction.<br>

DOI： 10.2109/jcersj.113.484

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Other Link： http://hdl.handle.net/10191/1228

Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2005f.0.642.0

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DOI： 10.14853/pcersj.2005f.0.654.0

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DOI： 10.14853/pcersj.2005f.0.585.0

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DOI： 10.14853/pcersj.2005f.0.657.0

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DOI： 10.14853/pcersj.2005f.0.651.0

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DOI： 10.14853/pcersj.2005f.0.649.0

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DOI： 10.14853/pcersj.2005f.0.648.0

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DOI： 10.14853/pcersj.2005f.0.647.0

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DOI： 10.14853/pcersj.2005f.0.655.0

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DOI： 10.14853/pcersj.2005s.0.309.0

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DOI： 10.14853/pcersj.2005f.0.663.0

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DOI： 10.14853/pcersj.2005f.0.656.0

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DOI： 10.14853/pcersj.2005f.0.650.0

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DOI： 10.14853/pcersj.2005f.0.753.0

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DOI： 10.14853/pcersj.2005f.0.45.0

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DOI： 10.14853/pcersj.2005f.0.652.0

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DOI： 10.14853/pcersj.2005f.0.768.0

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Publisher：The Ceramic Society of Japan  

There are several advantages in microwave heating compared with conventional heating techniques, in view of potentials for energy saving and shorter processing time for inorganic materials syntheses. In this presentation, we report a self-consistently completed solid-state reaction for syntheses of YVO<SUB>4</SUB>:Eu<SUP>3+</SUP>, Mg<SUB>2</SUB>SnO<SUB>4</SUB>:Mn<SUP>2+</SUP> phosphors, and LiFePO<SUB>4</SUB> cathode materials using a microwave heating.

DOI： 10.14853/pcersj.2005f.0.733.0

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Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2005s.0.460.0

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Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2005f.0.664.0

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Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2004f.0.297.0

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DOI： 10.14853/pcersj.2004f.0.624.0

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DOI： 10.14853/pcersj.2004f.0.477.0

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DOI： 10.14853/pcersj.2004f.0.110.0

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DOI： 10.14853/pcersj.2004f.0.150.0

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Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2004f.0.645.0

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Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2004f.0.643.0

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Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2004f.0.644.0

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Publisher：The Ceramic Society of Japan  

Luminescence properties under a vacuum ultraviolet (VUV) excitation investigated for phosphors in SrO-B₂O₃-P₂O₅ ternary system. The borophosphates have a relatively strong absorption band in a VUV region because of strong covalent characters of B-O and P-O bonds. One of these phosphors activated by Eu²⁺ showed a strong luminescence, which is about twice as bright as a commercial blue phosphor, BAM (BaMgAl₁₀O₁₇: Eu²⁺). This can be an attractive candidate of phosphors for plasma display panels (PDPs) and mercury-free fluorescent lamps.

DOI： 10.14853/pcersj.2004s.0.554.0

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Language：Japanese   Publisher：Japan Radioisotope Association  

<I>Silica gels and porous glasses thermally treated at various temperatures were examined for use as an adsorbent to separate tritiated water</I> (HTO) <I>with an adsorption method. The</I> HTO <I>was adsorbed much stronger than</I> H<SUB>2</SUB>O. <I>A high partition coefficient of 1.38 was observed for the thermally treated silica gel at 1100°C in vacuo. From the measurement of</I> IR <I>spectra, isolated silanol groups were formed on the thermally treated silica gel surface. We can conclude that there is a large mass effect for the concentration of tritiated water on the thermally treated silica gels because hydroxyl groups or water molecules adsorbed on them are difficult to form hydrogen bonds with each other.</I>

DOI： 10.3769/radioisotopes.53.435

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Other Link： http://www.jstage.jst.go.jp/article/radioisotopes1952/53/8/53_8_435/_pdf

Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2004f.0.478.0

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