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1991 Fiscal Year Final Research Report Summary

Structure and Dynamical Properties of Superionic Conductors

Research Project

Project/Area Number 01580051
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 結晶学
Research InstitutionIbaraki University

Principal Investigator

SAKUMA Takashi  Ibaraki University, Faculty of Science, Assistant Professor, 理学部, 助教授 (10114018)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Haruyuki  Ibaraki University, Faculty of Engineering, Lecturer, 工学部, 講師 (30202154)
Project Period (FY) 1989 – 1991
KeywordsSuperionic Conductors / Anomalous X-ray Scattering / Neutron Inelastic Scattering / Phase Transition / Specific Heat
Research Abstract

1. The cubic system of the space group denoted by O^5_-Fm3m with the lattice constant of alpha=5.833<plus-minus>0.003 A has been found feasible for the crystal structure of superionic phase of Cu_2Se at 473 K using the usual powder X-ray diffraction method. The conclusion has also been supported by the anomalous X-ray scattering measurement.
2. The crystal structure of CuBrSe_3 at room temperature has been analyzed by the Rietveld method with X-ray powder diffraction data. It belongs to the orthorhombic system with the space group Pnc2. The structure of CuBrSe_3 includes the ordered arrangement of Cu^+ ions.
3. Specific heat vs temperature curve was measured in the temperature range between 100 K and 523 K. New phase transitions in CuBrTe, CuITe and CulTe_2 were observed at 230 K, 281 K and 286 K, respectively. The new phases obtained by the present specific heat measurement at low temperature would be related to an ordered distribution of copper atoms.
4. Phase diagram of CuBrTe-CuXTe (X=C1 and I) system was determined from the analysis of the specific heat vs temperature curves.
5. Neutron inelastic scatterings of Cu_2Se, CuI, Cu_<1.8>Se and Cu_<1.8>S were measured by the time-of-flight method at room temperature. Low-lying despersionless excitations near *omega - 3.4 meV, which would be common to copper ion conductors, existed in these substances.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 佐久間 隆: "X線異常散乱法を利用した結晶性物質のキャラクタリゼ-ション" 日本金属学会会報. 28. 195-202 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "Low-Energy Excitation in β-Cu_2Se" J.Pyhs.Soc.Jpn. 58. 3061-3064 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "Determination of the Crystal Structure of Superionic Phase of Cu_2Se" Materials Transactions,JIM. 30. 365-369 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "Low-Energy Excitation in Copper Ion Conductors" Solid State Ionics. 40/41. 337-340 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "Crystal Structure of CuBrSe_3" J.Phys.Soc.Jpn.60. 1608-1611 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "The Existence of New Phases in CuBrTe,CuITe and CulTe_2" J.Phys.Soc.Jpn.60. 1136-1137 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "Phase Transition and Space Group of CuBrTe" J.Phys.Soc.Jpn.60. 3188-3189 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakuma: "Phase Diagram of CuBrTe-CuXTe(X=Cl,I)System" J.Phys.Soc.Jpn.61. 744-745 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sakuma, K. Sugiyama, E. Matsubara and Y. Waseda: "Determination of the Crystal Structure of Superionic Phase of Cu_2Se" Materials Transactions, JIM. 30. 365-369 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma , K. Sugiyama and Y. Waseda: "Characterization of Crystalline Materials by Anomalous X-ray Scattering" Nihon Kinzoku Gakkai Kaiho. 28. 195-202 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma and K. Shibata: "Low-Energy Excitation in beta-Cu_2Se" J. Phys. Soc. Jpn.58. 3061-3064 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma, K. Shibata and S. Hoshino: "Low-Energy Excitation in Copper Ion Conductors" Solid State Ionics. 40/41. 337-340 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma, T. Kaneko, T. Kurita and H. Takahashi: "Crystal Structure of CuBrSe_3" J. Phys. Soc. Jpn.60. 1608-1611 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma, T. Kaneko, H. Takahashi and K. Honma: "The Existence of New Phases in CuBrTe, CuITe and CuITe_2" J. Phys. Soc. Jpn.60. 1136-1137 (1911)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma and T. Kaneko: "Phase Transition and Space Group of CuBrTe" J. Phys. Soc. Jpn.60. 3188-3189 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakuma, T. Kaneko, H. Takahashi and K. Honma: "Phase Diagram of CuBrTe-CuXTe (X=Cl, I) System" J. Phys. Soc. Jpn.61. 744-745 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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