| 摘要 |
The present invention provides an oxide superconductor which is mainly composed of bismuth, lead, strontium, calcium, magnesium, and copper and has the composition represented by the formula: Bi1-APbASr1-BMgBCa1Cu1.7+/-0.3Ox wherein A=0.15-0.35 and B=0.05-0.3 in which numerals represent atomic ratio and an oxide superconductor which is mainly composed of bismuth, lead, strontium, calcium, magnesium, barium and copper and has the composition represented by the formula: Bi1-APbASr1-(B+C)(MgBBaC)Ca1Cu1.7+/-0.3Ox wherein A=0.15-0.35, B=0.05-0.3 and C=0.02-0.2 in which numerals represent atomic ratio. Methods for producing these superconductors are also provided.
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