| 摘要 |
PROBLEM TO BE SOLVED: To provide a Bi based superconductive object in which superconducting transition is steep and which has a critical temperature higher than 110 K, and to provide a superconductivity wire rod and a superconductive apparatus containing the Bi based superconductive object. SOLUTION: This Bi based superconductive object comprises (Bi, Pb)2223 as a superconductivity phase, wherein a first critical temperature T<SB>1C</SB>is higher than 110.0 K in which a magnetic susceptibility which is measured in a status that a magnetic field is impressed in a direction parallel to a c-axis of the (Bi, Pb)2223, and is standardized by 50 K becomes -0.5, and ¾T<SB>2C</SB>-T<SB>1C</SB>¾ which is the difference between a second critical temperature T<SB>2C</SB>in which a magnetic susceptibility becomes -0.1 and the first critical temperature T<SB>1C</SB>is 1.0 K or less. Further preferably, ¾T<SB>3C</SB>-T<SB>1C</SB>¾ which is the difference between a third critical temperature T<SB>3C</SB>in which a magnetic susceptibility becomes -0.001 and the first critical temperature T<SB>1C</SB>is 3.0 K or less. COPYRIGHT: (C)2008,JPO&INPIT
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