• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

The Study of Thermal Equilibrium and Highly Oxygenated State under High Oxygen Pressure

Research Project

Project/Area Number 07554032
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Inorganic chemistry
Research InstitutionThe University of Tokyo

Principal Investigator

UEDA Yutaka  The University of Tokyo Institution for Solid State Physics (ISSP), Professor, 物性研究所, 教授 (20127054)

Co-Investigator(Kenkyū-buntansha) TOJIMA Katsuyoshi  MacScience Company, Managing Director, 熱分析事業部, 部長
HAYASHI Akihiko  University of Tokyo, ISSP,Research Associate, 物性研究所, 助手 (10228562)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥12,200,000 (Direct Cost: ¥12,200,000)
Fiscal Year 1997: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥11,100,000 (Direct Cost: ¥11,100,000)
Keywordshigh pressure TG-DTA / high oxygen pressure / phase equilibrium / order-disorder transition / highly oxygenated state / high temperature / 酸素不定比性 / 熱平衡 / 熱分解 / 相転移 / 過剰酸素 / 金属イオン欠損
Research Abstract

In this study, we have developed a new apparatus by which thermogravimetry and differential thermal analysis (TG-DTA) can be performed under high gaseous pressure. By using this apparatus, we have investigated oxygen nonstoichiometry and phase transition in high temperature superconductors RBa_2Cu_3O_y (R=Y,Sm, Er) under high oxygen pressure up to 150 atm. We observed a reversible weight change between room temperature and 300゚C above 10 atm. From various experiments it was concluded that this behavior is due to buoyancy under a dense gas. The behavior was quantitatively explained by the calculation taking buoyancy into a consideration. The observed TG curves were corrected by using this calculation. RBa_2Cu_3O_y shows a transition from orthorhombic to tetragonal which is a kind of order-disorder transition. It has been unknown how is the transition in the region of high oxygen content. We first observed the transition in such high oxygen content region. The transition temperature (T_t) has a trend to saturate at 830゚C in YBa_2Cu_3O_y and 730゚C in SmBa_2Cu_3O_y around y=6.75, and in ErBa_2Cu_3O_y it tends to increase again above y=6.75. These behaviors suggest an existence of a new phase with an another arrangement of oxygen vacancies around y=6.75. And we found interesting pressure dependences of thermal decomposition in some oxalic acids. This machine is available for hydrogen atmosphere.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (31 results)

All Other

All Publications (31 results)

  • [Publications] A.I.Ryokov: "NMR and Magnetic Susceptibility in Superconducting and AntiferromagneticGa-based Cuprates Y_<1-x>Ca_xSr_2Cu_2GaO_7(0【greater than or equal】x【greater than or equal】0.3)." Physica C. 257. 86-98 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hiroyasu Tamura: "Phase Diagram of La_2NiO_<4+>δ(0【greater than or equal】δ【greater than or equal】0.18).II.Thermodynamics of Excess Oxygen,Phase Transitions and Phase Se " Physica C. 258. 61-71 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yosio Oka: "Hydrothermal Synthesis,Crystal Structure,and Magnetic Properties of FeVO_4-II." Journal of Solid State Chemistry. 123. 54-59 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.I.Rykov: "Magnetic Susceptibility of the Orthorhombic 2D-Antiferromagnet YSr_2Cu_2GaO_7." Physica C. 263. 359-362 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Atsushi Goto: "Carrier Concentration Dependenceof the Spin Pseudo-Gap Behaviors in YBa_2Cu_3O_y." Journal of Physical Society of Japan. 65. 3043-3048 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Atsushi Goto: "Phase Diagram for the Spin Pseudogap in LaBa_2Cu_3O_y Studied by NMR." Physical Review B. 55. 12736-12741 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Goto, H.Yasuoka, K.Otzschi and Y.Ueda: "Carrier Concentration Dependence of the Pseudo Spin Gap Behavior in LaBa_2Cu_3O_y." J.Phys.Soc.Japan. 64. 367-370 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Otzschi, K.Koga and Y.Ueda: "Relations between Oxygen Deficiency and Structure in the La-Sr-Cu-O System. III.Oxygen Content and Structure of the (La, Sr)_8Cu_8O_<16+delta>Phase" J.Solid State Chem.115. 490-498 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.I.Rykov, H.Yasuoka and Y.Ueda: "Charge Transfer to the Local Singlet States as a Function of Li Content in La_2Cu_<1-x>Li_xO_4 and La_<1.85>Sr_<0.15>Cu_<1-x>Li_xO_4." Physica C. 247. 327-339 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Katano, Y.Ueda, A.Hayashi and N.Mori: "Phase Transitions and Superconductivity of Sr-substituted La_<2-x>Ba_xCuO_4 (x=0.125)" Physica B. 213 & 214. 81-83 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.I.Rykov, Y.Ueda, A.Goto and H.Yasuoka: "NMR and Magnetic Susceptibility in Superconducting and Antiferromagnetic Ga-based Cuprates Y_<1-x>Ca_xSr_2Cu_2GaO_7 (0<less than or equal>x<less than or equal>0.3)" Physica C. 257. 86-98 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Tamura, A.Hayashi and Y.Ueda: "Phase Diagram of La_2NiO_<4+delta> (0<less than or equal>delta<less than or equal>0.18). II.Thermodynamics of Excess Oxygen, Phase Transitions (0.06<less than or equal>delta<0.11) and Phase Segregation (0.03<less than or equal " Physica C. 258. 61-71 (1966)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Oka, T.Yao, N.Yamamoto, Y.Ueda, S.Kawasaki, M.Azuma and M.Takano: "Hydrothermal Synthesis, Crystal Structure, and Magnetic Properties of FeVO_4-II." J.Solid State Chem.123. 54-59 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.I.Rykov, Y.Ueda and A.Hayashi: "Magnetic Susceptibility of the Orthorhombic 2D-Antiferromagnet YSr_2Cu_2GaO_7." Physica C. 263. 359-362 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Goto, H.Yasuoka and Y.Ueda: "Carrier Concentration Dependence of the Spin Pseudo-Gap Behaviors in YBa_2Cu_3O_y." J.Phys.Soc.Japan. 65. 3043-3048 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Goto, H.Yasuoka, K.Otzschi and Y.Ueda: "Phase Diagram for the Spin Pseudogap in LaBa_2Cu_3O_y Studied by NMR" Phys.Rev.B. 55. 12736-12741 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.I.Rykov: "NMR and Magnetic Susceptibility in Superconducting and Antiferromagnetic Ga-based Cuprates Y_<1-x>Ca_xSr_2Cu_2GaO_7 (0【less than or equal】x【less than or equal】0.3)" Physica C. 257. 86-98 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hiroyasu Tamura: "Phase Diagram of La_2NiO_<4+δ> (0【less than or equal】δ【less than or equal】0.18).II.Thermodynamics of Excess Oxygen,Phase Transitions and Phase Segregat " Physica C. 258. 61-71 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yoshio Oka: "Hydrothermal Synthesis,Crystal Structure,and Magnetic Properties of FeVO_4-II." Journal of Solid State Chemistry. 123. 54-59 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.I.Rykov: "Magnetic Susceptibility of the Orthorhombic 2D-Antiferromagnet YSr_2Cu_2GaO_7." Physica C. 263. 359-362 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Atsushi Goto: "Carrier Concentration Dependence of the spin Pseudo-Gap Behaviors in YBa_2Cu_3O_y." Journal of Physical Society of Japan. 65. 3043-3048 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Atsushi Goto: "Phase Diagram for the Spin Pseudogap in LaBa_2Cu_3O_y Studied by NMR." Physical Review B. 55. 12736-12741 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.I.Rykov: "NMR and Magnetic Susceptibility in Superconducting and Antiferromagnetic Ga-based Cuprates Y1-xCaxSr_2Cu_2GaO_7(0×0.3)" Physica C. 257. 86-98 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Hiroyasu Tamura: "Phase Diagram of La_2NiO_<4+>(0 0.18).II^. Thermodynamics of Excess Oxygen,Phase Transition and Phase Segregation" Physica C. 258. 61-71 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yoshio Oka: "Hydrothermal Synthesis,Crystal Structure and Magnetic Properties of FeVO_4-II" J.Solid State Chemistry. 123. 54-59 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] A.I.Rykov: "Magnetic Susceptibility of the Orthorhombic 2D-Antiferromagnet YSr_2Cu_2GaO_7" Physica C. 263. 359-362 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Atsushi Goto: "Carrier Concentration Dependence of the Spin Pseudo-Gap Behaviors in YBa_2Cu_3O_y" J.Phys.Soc.Japan. 65. 3043-3048 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Jun Kikuchi: "^<51>V NMR Study in the Paramagnetic State of LaVO_3" J.Phys.Soc.Japan. 65. 2655-2663 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Atsushi Goto: "Carrier Concentration Dependence of the Pseudo Spin Gap Behavior in LaBa_2Cu_3O_y" Journal of the Physical Society of Japan. 64. 367-370 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Yutaka Itoh: "Evidence for Temperature-Dependent Antiferromagnetic Correlation Length in High-T_c Cu Oxides" Journal of the Physical Society of Japan. 64. 3072-3081 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kenji Otzschi: "Relation between Oxygen Deficiency and Structures in the La-Sr-Cu-O System III.(La,Sr)_8Cu_8O_<16+>" Journal of Solid State Chemistry. 115. 490-498 (1995)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi