| Budget Amount *help |
¥20,540,000 (Direct Cost: ¥15,800,000、Indirect Cost: ¥4,740,000)
Fiscal Year 2009: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2008: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2007: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
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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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