All Stories

  1. Structural change of NaO1/2–WO3–NbO5/2–LaO3/2–PO5/2glass induced by electrochemical substitution of sodium ions with protons

    Article • Physical Chemistry Chemical Physics, January 2015, Royal Society of Chemistry

    Associate Professor Takahisa Omata

  2. Phase separation and crystallization in sodium lanthanum phosphate glasses induced by electrochemical substitution of sodium ions with protons

    Article • Physical Chemistry Chemical Physics, January 2015, Royal Society of Chemistry

    Associate Professor Takahisa Omata

  3. Facile synthesis of colloidal InAs nanocrystals using triphenylarsine as an arsenic source

    Article • Journal of Crystal Growth, November 2014, Elsevier

    Associate Professor Takahisa Omata

  4. Proton conducting tungsten phosphate glass and its application in intermediate temperature fuel cells

    Article • Solid State Ionics, September 2014, Elsevier

    Associate Professor Takahisa Omata

  5. Electronic transition responsible for size-dependent photoluminescence of colloidal CuInS2quantum dots

    Article • Journal of Materials Chemistry C, June 2014, Royal Society of Chemistry

    Associate Professor Takahisa Omata

  6. ChemInform Abstract: Wurtzite CuGaO2: A New Direct and Narrow Band Gap Oxide Semiconductor Applicable as a Solar Cell Absorber.

    Article • ChemInform, June 2014, Wiley

    Associate Professor Takahisa Omata

  7. Fabrication of β-AgGaO2 thin films by radio frequency magnetron sputtering

    Article • Thin Solid Films, May 2014, Elsevier

    Associate Professor Takahisa Omata

  8. Phase determination of zinc selenide nanocrystals depending on the ligand species of precursor complexes

    Article • Journal of Crystal Growth, May 2014, Elsevier

    Associate Professor Takahisa Omata

  9. Wurtzite CuGaO2: A New Direct and Narrow Band Gap Oxide Semiconductor Applicable as a Solar Cell Absorber

    Article • Journal of the American Chemical Society, February 2014, American Chemical Society (ACS)

    Associate Professor Takahisa Omata

  10. Electrochemical substitution of sodium ions with protons in phosphate glass to fabricate pure proton conducting glass at intermediate temperatures

    Article • Journal of Materials Chemistry A, January 2014, Royal Society of Chemistry

    Associate Professor Takahisa Omata

  11. Synthesis of colloidal solution of ^|^beta;-LiGaO2 nanocrystals capped with organic surfactant

    Article • Journal of the Ceramic Society of Japan, January 2014, Ceramic Society of Japan

    Associate Professor Takahisa Omata

  12. Enhancement by praseodymium addition of catalytic activity of nickel supported on cerium^|^ndash;zirconium oxide in methane steam reforming

    Article • Journal of the Ceramic Society of Japan, January 2014, Ceramic Society of Japan

    Associate Professor Takahisa Omata

  13. ^|^alpha;-PbO2-related phase appearing in the SnIV^|^ndash;Ta^|^ndash;O system transformed from cation-ordered fluorite-related phase

    Article • Journal of the Ceramic Society of Japan, January 2014, Ceramic Society of Japan

    Associate Professor Takahisa Omata

  14. Electrochemical Substitution of Sodium Ions in Tungsten Phosphate Glass with Protons

    Article • Journal of The Electrochemical Society, October 2013, The Electrochemical Society

    Associate Professor Takahisa Omata

  15. Fabrication of ZnF2 thin films and their vacuum ultraviolet transparency

    Article • Thin Solid Films, May 2013, Elsevier

    Associate Professor Takahisa Omata

  16. Impact of the Electrical Forming Process on the Resistance Switching Behaviors in Lanthanum-Doped Strontium Titanate Ceramic Chip Devices

    Article • Japanese Journal of Applied Physics, April 2013, Institute of Physics Publishing

    Associate Professor Takahisa Omata

  17. Degradation of potential barriers in ZnO-based chip varistors due to electrostatic discharge

    Article • Journal of Applied Physics, August 2012, American Institute of Physics

    Associate Professor Takahisa Omata

  18. Structural variation and optical properties of ZnO–LiGaO2 pseudo-binary system

    Article • Journal of Solid State Chemistry, April 2012, Elsevier

    Associate Professor Takahisa Omata

  19. Quantum dot phosphors and their application to inorganic electroluminescence device

    Article • Thin Solid Films, March 2012, Elsevier

    Associate Professor Takahisa Omata

  20. Synthesis of LiGaO2 nanocrystals and their application toward bright UV emission from ZnO quantum dots

    Article • Journal of Crystal Growth, September 2011, Elsevier

    Associate Professor Takahisa Omata

  21. Fabrication of ZnO Films Alloyed with LiGaO 2 by RF-Magnetron Sputtering and Their Optical Property

    Article • Japanese Journal of Applied Physics, June 2011, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  22. Fabrication of ZnO Films Alloyed with LiGaO 2 by RF-Magnetron Sputtering and Their Optical Property

    Article • Japanese Journal of Applied Physics, June 2011, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  23. Fabrication of Core–Shell-Type Copper Indium Selenide and Zinc Selenide Composite Quantum Dots and Their Optical Properties

    Article • Journal of Nanoscience and Nanotechnology, June 2011, American Scientific Publishers

    Associate Professor Takahisa Omata

  24. Zn 2 LiGaO 4 , Wurtzite-Derived Wide Band Gap Oxide

    Article • Japanese Journal of Applied Physics, March 2011, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  25. Zn 2 LiGaO 4 , Wurtzite-Derived Wide Band Gap Oxide

    Article • Japanese Journal of Applied Physics, March 2011, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  26. UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water

    Article • Journal of Colloid and Interface Science, March 2011, Elsevier

    Associate Professor Takahisa Omata

  27. Synthesis of CuInS2 nanocrystals and their structural transformation triggered by ligand exchange

    Article • Chinese Science Bulletin, November 2009, Springer Science + Business Media

    Associate Professor Takahisa Omata

  28. Synthesis of Ternary CuInS2 Nanocrystals; Phase Determination by Complex Ligand Species

    Article • Chemistry of Materials, May 2009, American Chemical Society (ACS)

    Associate Professor Takahisa Omata

  29. Synthesis of Y2O3-doped CeO2nanocrystals and their surface modification

    Article • Journal of Physics Conference Series, May 2009, Institute of Physics Publishing

    Associate Professor Takahisa Omata

  30. A Cu-added Zr-Ce-Sn-Pr-O mixed oxide phase with a high oxygen storage capacity

    Article • Journal of Physics Conference Series, May 2009, Institute of Physics Publishing

    Associate Professor Takahisa Omata

  31. Photoluminescence of CuInS2-based semiconductor quantum dots; Its origin and the effect of ZnS coating

    Article • Journal of Physics Conference Series, May 2009, Institute of Physics Publishing

    Associate Professor Takahisa Omata

  32. Size dependent optical band gap of ternary I-III-VI2 semiconductor nanocrystals

    Article • Journal of Applied Physics, April 2009, American Institute of Physics

    Associate Professor Takahisa Omata

  33. Colloidal Synthesis of Ternary Copper Indium Diselenide Quantum Dots and Their Optical Properties

    Article • The Journal of Physical Chemistry C, February 2009, American Chemical Society (ACS)

    Associate Professor Takahisa Omata

  34. Synthesis of Organic Capped Colloidal Zinc Oxide Quantum Dots and Their UV Dominant Emission Property

    Article • MRS Proceedings, January 2009, Springer Science + Business Media

    Associate Professor Takahisa Omata

  35. Extremely Suppressed Grain Growth of Y[sub 2]O[sub 3]-Stabilized Zirconia Nanocrystals Synthesized by the Nonhydrolytic Sol–Gel Technique

    Article • Journal of The Electrochemical Society, January 2009, The Electrochemical Society

    Associate Professor Takahisa Omata

  36. Zr-Ce-Pr-O Mixed Oxide Phases with High Oxygen Storage Capacity (OSC)

    Article • Journal of the Japan Institute of Metals and Materials, January 2009, Japan Institute of Metals

    Associate Professor Takahisa Omata

  37. Zr-Ce-Pr-Cu-O 系酸化物の相平衡と酸素放出・吸収特性

    Article • Journal of the Japan Institute of Metals and Materials, January 2009, Japan Institute of Metals

    Associate Professor Takahisa Omata

  38. Mixed dopant effect in SrZrO3-based proton conductor

    Article • Solid State Ionics, September 2008, Elsevier

    Associate Professor Takahisa Omata

  39. Formation of Ni3C Nanocrystals by Thermolysis of Nickel Acetylacetonate in Oleylamine: Characterization Using Hard X-ray Photoelectron Spectroscopy

    Article • Chemistry of Materials, June 2008, American Chemical Society (ACS)

    Associate Professor Takahisa Omata

  40. Wide band gap semiconductor alloy: x(LiGaO2)1∕2–(1−x)ZnO

    Article • Journal of Applied Physics, April 2008, American Institute of Physics

    Associate Professor Takahisa Omata

  41. Chemical role of amines in the colloidal synthesis of CdSe quantum dots and their luminescence properties

    Article • Journal of Luminescence, September 2007, Elsevier

    Associate Professor Takahisa Omata

  42. Nanocrystals of zirconia- and ceria-based solid electrolytes: Syntheses and properties

    Article • Science and Technology of Advanced Materials, January 2007, Taylor & Francis

    Associate Professor Takahisa Omata

  43. Tunable Photoluminescence Wavelength of Chalcopyrite CuInS2-Based Semiconductor Nanocrystals Synthesized in a Colloidal System

    Article • Chemistry of Materials, June 2006, American Chemical Society (ACS)

    Associate Professor Takahisa Omata

  44. Characterization of indium–tin oxide sputtering targets showing various densities of nodule formation

    Article • Thin Solid Films, May 2006, Elsevier

    Associate Professor Takahisa Omata

  45. Synthesis of CeO[sub 2], ZrO[sub 2] Nanocrystals, and Core-Shell-Type Nanocomposites

    Article • Journal of The Electrochemical Society, January 2006, The Electrochemical Society

    Associate Professor Takahisa Omata

  46. Electrical Conduction Properties of Sr‐Doped LaPO4 and CePO4 under Oxidizing and Reducing Conditions.

    Article • ChemInform, June 2005, Wiley

    Associate Professor Takahisa Omata

  47. Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn–Ta–O pyrochlore

    Article • Journal of Solid State Chemistry, April 2005, Elsevier

    Associate Professor Takahisa Omata

  48. Synthesis of CdSe Quantum Dots Using Micro-Flow Reactor and Their Optical Properties

    Article • Japanese Journal of Applied Physics, January 2005, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  49. Infrared Study of High-Temperature Proton-Conducting Aliovalently Doped SrZrO[sub 3] and BaZrO[sub 3]

    Article • Journal of The Electrochemical Society, January 2005, The Electrochemical Society

    Associate Professor Takahisa Omata

  50. Formation and Thermal Stability of Hydrate-Like Compounds of Ba[sub 2](In[sub 1−x]M[sup III]x])[sub 2]O[sub 5]⋅nH[sub 2]O (M[sup III]=Ga, Sc, Lu, and Y)

    Article • Journal of The Electrochemical Society, January 2005, The Electrochemical Society

    Associate Professor Takahisa Omata

  51. Electrical Conduction Properties of Sr-Doped LaPO[sub 4] and CePO[sub 4] under Oxidizing and Reducing Conditions

    Article • Journal of The Electrochemical Society, January 2005, The Electrochemical Society

    Associate Professor Takahisa Omata

  52. Characterization of novel cation-ordered compounds with fluorite and α-PbO2 related structures prepared by oxidation of Sn–Nb–O pyrochlore

    Article • Journal of Physics and Chemistry of Solids, January 2005, Elsevier

    Associate Professor Takahisa Omata

  53. Photocatalytic behavior of cerium titanates, CeTiO4 and CeTi2O6 and their composite powders with SrTiO3

    Article • Journal of Alloys and Compounds, August 2004, Elsevier

    Associate Professor Takahisa Omata

  54. Synthesis of novel compounds with cation ordered fluorite and α-PbO2 related structures by oxidation of Sn2Nb2O7 pyrochlore

    Article • Journal of Alloys and Compounds, May 2004, Elsevier

    Associate Professor Takahisa Omata

  55. Thermodynamic Stability of Metastable Tetragonal t'-Ce0.5Zr0.5O2 Phase in the CeO2-ZrO2 system

    Article • High Temperature Materials and Processes, August 2003, De Gruyter

    Associate Professor Takahisa Omata

  56. Photocatalytic behavior of titanium oxide-perovskite type Sr(Zr1−xYx)O3−δ composite particles

    Article • Journal of Photochemistry and Photobiology A Chemistry, March 2003, Elsevier

    Associate Professor Takahisa Omata

  57. Photobleaching of Methylene Blue Aqueous Solution Sensitized by Composite Powders of Titanium Oxide with SrTiO3, BaTiO3, and CaTiO3

    Article • MATERIALS TRANSACTIONS, January 2003, Japan Institute of Metals

    Associate Professor Takahisa Omata

  58. Photodegradation of Methylene Blue Aqueous Solution Sensitized by Pyrochlore-Related .KAPPA.-CeZrO4 Oxide Powder

    Article • MATERIALS TRANSACTIONS, January 2003, Japan Institute of Metals

    Associate Professor Takahisa Omata

  59. Effect of Dopant Species on the Dissolving Site of the Protons in La[sub 2]Zr[sub 2]O[sub 7]-Doped with Alkaline-Earth Ions

    Article • Journal of The Electrochemical Society, January 2003, The Electrochemical Society

    Associate Professor Takahisa Omata

  60. ChemInform Abstract: Crystal Structure of Metastable ϰ‐CeZrO4 Phase Possessing an Ordered Arrangement of Ce and Zr Ions.

    Article • ChemInform, April 2001, Wiley

    Associate Professor Takahisa Omata

  61. Infrared Absorption Spectra of High Temperature Proton Conducting Ca[sup 2+]-Doped La[sub 2]Zr[sub 2]O[sub 7]

    Article • Journal of The Electrochemical Society, January 2001, The Electrochemical Society

    Associate Professor Takahisa Omata

  62. Electrical conductivity of metastable κ-CeZrO4 phase possessing ordered arrangement of Ce and Zr ions

    Article • Science and Technology of Advanced Materials, January 2001, Taylor & Francis

    Associate Professor Takahisa Omata

  63. Electrical Properties of Proton-Conducting Ca[sup 2+]-Doped La[sub 2]Zr[sub 2]O[sub 7] with a Pyrochlore-Type Structure

    Article • Journal of The Electrochemical Society, January 2001, The Electrochemical Society

    Associate Professor Takahisa Omata

  64. Oxygen release behavior of metastable tetragonal t′meta-(Ce0.5Zr0.5)2 phases prepared by reduction and successive oxidation of t′ phase

    Article • Science and Technology of Advanced Materials, January 2001, Taylor & Francis

    Associate Professor Takahisa Omata

  65. Crystal structure of metastable κ-CeZrO4 phase possessing an ordered arrangement of Ce and Zr ions

    Article • Journal of Alloys and Compounds, November 2000, Elsevier

    Associate Professor Takahisa Omata

  66. Electrical Conductivity of Novel Tetragonal t′meta-(Ce0.5Zr0.5)O2 Phase Prepared by Reduction and Successive Oxidation of t′ Phase

    Article • Journal of Solid State Chemistry, May 2000, Elsevier

    Associate Professor Takahisa Omata

  67. Vibrational Spectroscopic and X-Ray Diffraction Studies of Cerium Zirconium Oxides with Ce/Zr Composition Ratio=1 Prepared by Reduction and Successive Oxidation of t′-(Ce0.5Zr0.5)O2 Phase

    Article • Journal of Solid State Chemistry, November 1999, Elsevier

    Associate Professor Takahisa Omata

  68. High Efficiency-Carrier-Generation for the Oxygen Release Reaction in Indium Tin Oxide

    Article • Japanese Journal of Applied Physics, July 1998, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  69. Oxygen Release Behavior of CeZrO4Powders and Appearance of New Compoundsκand t*

    Article • Journal of Solid State Chemistry, June 1998, Elsevier

    Associate Professor Takahisa Omata

  70. Oxygen release behaviour of Ce(1−)Zr O2 powders and appearance of Ce(8−4)Zr4O(14−) solid solution in the ZrO2–CeO2–CeO1.5 system

    Article • Journal of Alloys and Compounds, May 1998, Elsevier

    Associate Professor Takahisa Omata

  71. In-Situ Observation of the Electrical Conductivity upon Release and Uptake of Oxygen in Indium Tin Oxide Sinter

    Article • Japanese Journal of Applied Physics, March 1998, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  72. Observation of Electronic Structure in Conduction Band of CaTiO3

    Article • Journal of the Ceramic Society of Japan, January 1998, Ceramic Society of Japan

    Associate Professor Takahisa Omata

  73. DC electrorheology of fluid suspending barium titanate in the range of ferroelectric size effects

    Article • Ferroelectrics, November 1997, Taylor & Francis

    Associate Professor Takahisa Omata

  74. Optical absorption spectra and the nature of conduction carriers of hole-doped Sr1+xLa1−xFeO4

    Article • Solid State Communications, February 1996, Elsevier

    Associate Professor Takahisa Omata

  75. Preparation and Electrical Properties of La2-xSrxMnO4+δ with K2NiF4-Structure

    Article • Journal of the Ceramic Society of Japan, January 1995, Ceramic Society of Japan

    Associate Professor Takahisa Omata

  76. Electronic Transport Properties of Hole-Doped Sr1+xLa1-xCrO4+δ

    Article • Journal of the Ceramic Society of Japan, January 1995, Ceramic Society of Japan

    Associate Professor Takahisa Omata

  77. Preparation of Cd1−xYxSb2O6 thin film on glass substrate by radio frequency sputtering

    Article • Applied Physics Letters, July 1994, American Institute of Physics

    Associate Professor Takahisa Omata

  78. Electronic structure of hole-doped Sr 1 + x La 1 − x FeO 4 studied by UPS and XAS

    Article • April 1994, American Physical Society (APS)

    Associate Professor Takahisa Omata

  79. Electrical and magnetic properties of hole-doped Sr 1 + x La 1 − x FeO 4

    Article • April 1994, American Physical Society (APS)

    Associate Professor Takahisa Omata

  80. New ultraviolet-transport electroconductive oxide, ZnGa2O4 spinel

    Article • Applied Physics Letters, February 1994, American Institute of Physics

    Associate Professor Takahisa Omata

  81. New Oxide Phase $\bf Cd_{2(1-{\ninmbi x})}Y_{2{\ninmbi x}}Sb_{2}O_{7}$ Pyrochlore with a Wide Band Gap and High Electrical Conductivity

    Article • Japanese Journal of Applied Physics, February 1994, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  82. New oxide phase Cd1−xYxSb2O6 with a wide band gap and high electrical conductivity

    Article • Applied Physics Letters, December 1993, American Institute of Physics

    Associate Professor Takahisa Omata

  83. Preparation of MgIn 2 O 4- X Thin Films on Glass Substrate by RF Sputtering

    Article • Japanese Journal of Applied Physics, September 1993, Japan Society of Applied Physics

    Associate Professor Takahisa Omata

  84. New oxide phase with wide band gap and high electroconductivity CdGa2O4 spinel

    Article • Applied Physics Letters, February 1993, American Institute of Physics

    Associate Professor Takahisa Omata

  85. New oxide phase with wide band gap and high electroconductivity, MgIn2O4

    Article • Applied Physics Letters, October 1992, American Institute of Physics

    Associate Professor Takahisa Omata