Abstract
The material system (Bi0.7Pb0.3)Sr1 Ca1 Cu1.8Ox forms, at 840° C, two major phases having a highTc (100K) and a lowTc (∼70 K) both of which consist of platelets and a non-superconducting minor phase which has a rod-like shape and is isolated by the major phases. As the sintering period increases, the amount of highTc phase increases accompanying the decrease in lowTc phase while the amount of the non-superconducting phase is independent of sintering period, resulting in a superconductor withTc of 100 K. Changes in compositions of each phase also occur during sintering due to evaporation of bismuth and lead.
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