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Study on the Percolation Process of Clusters in Multiphase Superconductor

Research Project

Project/Area Number 02650519
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionKyoto University

Principal Investigator

YOSHIDA Katsukuni  Kyoto University, Institute of Atomic Energy, Associate Professor, 原子エネルギー研究所, 助教授 (70027142)

Co-Investigator(Kenkyū-buntansha) UEDA Sizumasa  Kyoto University, Institute of Atomic Energy, Technician, 原子エネルギー研究所, 教務職員 (00093196)
TOMII Yoichi  Kyoto University, Faculty of Engineering, Lecturer, 工学部, 講師 (90026245)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1991: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1990: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsPercolation / Multiphase Materials / High T_c Superconductor / Clusters / Critical Current / Bi-Pb-Sr-Ca-Cu-O oxide / Ag Doping / Crystalline Junction / Bi系超伝導酸化物 / 臨界電流の温度依存性 / 転移温度の電流依存性
Research Abstract

In order to reveal the problem of how the behavior of constituent phases in multiphase superconductors characterizes the superconducting properties, an experimental study was made of the network structure of the crystalline clusters of the high T_2 oxide of Bi-(Pb)-Sr-Ca-Cu-0 systems(By systems), to which oxide Ag_2O was doped. We investigated this problem in particular reference to the percolation process of the clusters, where the superconducting junction between adjacent crystallines plays an important role. Main results are sunynarized as follows. 1. A small amount of doped Ag, which was produced by dissolving Ag_2O during the sintering the above Bi compound, exerts a considerable deteriorating effect on the superconducting properties. This effect implies that the superconducting junction between crystallines is largely affected by the presence of nonsuperconducting compound like Ca_2PO_4, formation of which is easily controlled by such doping. 2. The X rgy diffraction does not show any change in the structure of the superconducting crystalline itself, and only demonstrates that the most amount of the doped Ag precipitates as a pure metallic phase. 3. The superconducting properties are remarkably affected also by the process of heat treatment(furnace cooled, air cooled or quenched to liquid nitrogen)after the sintering fabrication of the samples. The faster cooling makes the superconducting properties worse. The heat treatment also strongly controls the crystalline interface. 4. The magneto resistance appearing below the transition temperature T@CCc@DD shows a large hysteresis for the samples with inferior superconducting properties. 5. The samples with good qualities exhibit a large diamagnetic susceptibility characteristic of the intergrain superconducting. 6. The above properties was discussed in terms of the percolation process by modeling a Josephson network.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Katsukuni YOSHIDA: "Experimental Uncertainty in Determining the Critical Exponent of the Percolative Conductivity of Two-Phase Mixtures" Journal of the Physical Society of Japan. 59. 1518-1519 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Percolative Conduction in a Composite System of Metal and Ceramics" Journal of the Physical Society of Japan. 59. 4087-4095 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Structural Effect on the Galvanomagnetic Properties of a Metal with Granular Inclusions" Journal of the Physical Society of Japan. 59. 4405-4411 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Dielectric Character Due to the Percolative Growth of Clusters in a Metal-Ceramics Mixture" Japanese Journal of Applied Physics. 30. 3482-3483 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉田 起國: "Josephson接合による超伝導ネットワ-クのパ-コレ-ション転移" 京都大学原子エネルギ-研究所彙報. 79. 43-43 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉田 起國: "Ag_2O添加BiーPbーSrーCaーCuーO系酸化物の超伝導特性(1)" 京都大学原子エネルギ-研究所彙報. 80. 40-40 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Experimental Uncertainty in Determining the Critical Exponent of the Percolative Conductivity of Two-Phase Mixtures" Journal of the Physical Society of Japan. 59. 1518-1519 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Percolative Conduction in a Composite System of Metal and Ceramics" Journal of the Physical Society of Japan. 59. 4087-4095 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Structural Effect on the Galvanomagnetic Properties of a Metal with Granular Inclusions" Journal of the Physical Society of Japan. 59. 4405-4411 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Dielectric Character Due to the Percolative Growth of Clusters in a Metal-Ceramics Mixture" Japanese Journal of Applied Physics. 30. 3482-3483 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Superconducting Netwark with Josephson Coupling and Its Percolation Transition" Bulletin of the Institute of Atomic Energy, Kyoto University. 79. 43 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Superconducting Properties of Ag_2O-Doped Bi-Pb-Sr-Ca-Cu-O System (1)" Bulletin of the Institute of Atomic Energy, Kyoto University. 80. 40 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Superconducting Properties of Ag_2O-Doped Bi-Pb-Sr-Ca-Cu-O System (2)" Bulletin of the Institute of Atomic Energy, Kyoto University. 80. 41 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Superconducting Properties of Ag_2O-Doped Bi-Pb-Sr-Ca-Cu-O System (3)" Bulletin of the Institute of Atomic Energy, Kyoto University. 31. 52 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Superconducting Properties of Ag_2O-Doped Bi-Pb-Sr-Ca-Cu-O System (4)" Bulletin of the Institute of Atomic Energy, Kyoto University. 81. 53 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Katsukuni YOSHIDA: "Dielectric Character Due to the Percolative Growth of Clusters in a MetalーCeramics" Japanese Journal of Applied Physics. 30. 3482-3483 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 吉田 起國: "Ag2O添加BiーPbーSrーCaーCuーO形酸化物の超伝導特性(1)" 京都大学原子エネルギ-研究所彙報. 80. 40-40 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 吉田 起國: "Ag2O添加BiーPbーSrーCaーCuーO形酸化物の超伝導特性(2)" 京都大学原子エネルギ-研究所彙報. 80. 41-41 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 吉田 起國: "Ag2O添加BiーPbーSrーCaーCuーO形酸化物の超伝導特性(3)" 京都大学原子エネルギ-研究所彙報. 81. 52-52 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 吉田 起國: "Ag2O添加BiーPbーSrーCaーCuーO形酸化物の超伝導特性(4)" 京都大学原子エネルギ-研究所彙報. 81. 53-53 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Katsukuni YOSHIDA: "Experimental Uncertainty in Determining the Crtical Exponent of the Percolative Conductivity of TwoーPhase Mixtures" Journal of the Physical Society of Japan. 59. 1518-1519 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Katsukuni YOSHIDA: "Percolative Conduction in a Composite System of Metal and Ceramics" Journal of the Physical Society of Japan. 59. 4087-4095 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Katsukuni YOSHIDA: "Structural Effect on the Galvanomagnetic Properties of a Metal with Granular Inclusions" Journal of the Physical Society of Japan. 59. 4405-4411 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 吉田 起國: "Josephson接合による超伝導ネットワ-クのパ-コレ-ション転移" 京都大学原子エネルギ-研究所彙報. 79. 43-43 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 吉田 起國: "パ-コレ-ション系における誘電率と伝導度の動的スケ-リング" 京都大学原子エネルギ-研究所彙報. 79. 42-42 (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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