2009 Fiscal Year Final Research Report
Research on Upper Limits of Critical Temperature of Practical Superconductors by Solid-State Chemistry
| Project/Area Number |
19360293
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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 | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SHIMOYAMA Jun-ichi The University of Tokyo, 大学院・工学系研究科, 准教授 (20251366)
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| Co-Investigator(Kenkyū-buntansha) |
KISHIO Kohji 東京大学, 大学院・工学系研究科, 教授 (50143392)
OGINO Hiraku 東京大学, 大学院・工学系研究科, 助教 (70359545)
HORII Shigeru 東京大学, 大学院・工学系研究科, 助教 (80323533)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 超伝導 / 化学組成 / 臨界温度 |
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| Research Abstract |
Enhancement of critical temperatures (T_c) of practical superconductors with high T_c has been attempted by precise control of their chemical compositions. For Bi-based oxide superconductors, T_c of Bi(Pb)2223 tapes was successfully enhanced up to 116K with maintaining strong grain coupling. On the other hand, nonstoichiometry in cation compositions of Y123 and heavy-RE123 oxide was discovered. The cation nonstoichiometry was found to seriously degrade superconducting properties, such as T_c and critical current properties. This new knowledge gave a new guideline to develop high performance materials.
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