1999 Fiscal Year Final Research Report Summary
Development of High Performance Superconducting Materials and Wires for Next Generation
| Project/Area Number |
10555306
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
無機工業化学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KISHIO Kohji Department of Applied Chemistry, The University of Tokyo, Professor, 大学院・工学系研究科, 教授 (50143392)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Ken-ichi Manager, Sumitomo Electric Industries Ltd., 基盤技術研究所, 部長
OTZSCHI Kenji Engineering Research Institute, The University of Tokyo, Research Associate, 工学部・附属総合試験所, 助手 (00301127)
SHIMOYAMA Jun-ichi Engineering Research Institute, The University of Tokyo, Associate Professor, 工学部・附属総合試験所, 助教授 (20251366)
KANEKO Tetsuyuki Scientist, Sumitomo Electric Industries, Ltd., 基盤技術研究所, 主任研究員
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| Project Period (FY) |
1998 – 1999
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| Keywords | Superconducting Materials / High-TィイD2cィエD2 Superconductors / Oxides / Critical Current Density / Liquid Nitrogen / Superconducting Wires / Superconducting Tapes / Process Control |
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| Research Abstract |
The goal of the present research are to improve the chemical and Structural stability and critical current densities of high temperature superconductors for next generation and to establish the manufacturing method for short and long length conductors for practical applications at liquid nitrogen temperature. While the mercury(Hg)-based cuprate superconductors have been known to be chemically rather unstable and its preparation process is not simple, we have found that doping of a small amount of transition ions such as rhenium(Re) or chromium(Cr) is quite effective in stabilization of the compounds. Single crystals of Re-doped Hg-Ba-Ca-Cu-O were successfully grown in both bulk and thick film tapes by the melt-solidification method. The Ag/Cr coated Ni foil wag found to be the moat favorite substrate for Hg-based tapes. Mechanisms of the improved flux pinning properties of heavily Pb-doped and oxygen controlled Bi2212 single crystal were elucidated. Processing techniques of Bi(Pb)2212./Ag composite tapes has been also developed.
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