| 简介 |
PROBLEM TO BE SOLVED : To satisfy the requirements such as electric characteristics, magnetic characteristics, mechanical characteristics and environmental resistance for a superconductor and to obtain a higher critical current density by allowing a twin crystal having a specified plane distance to be present in a specified crystal phase which constitutes the superconducting phase. SOLUTION : The RE-Ba-Cu-O-based oxide superconductor has fine dispersion of RE2(1-q) Ba1+r CUO5+s phase (211 phase) and/or RE4(1-q) Ba2(1+r) CU2 O2(5+s) phase (422 phase) 10 RE1-x Ba2+y CU3 Od phase (123 phase) which constitutes the superconducting phase. In this superconductor, a twin crystal is present in the (123 phase) crystal phase and the distance between the twin crystal planes is <100 nm. Further, the superconductor has an amorphous phase on the interface between the (123 phase) and the (211 phase) and/or the (422 phase). In the formulae, RE represents one or more rare earth metal elements including Y; (x), (y), (d) satisfy -0.3
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