Processing Dependence on Microstructure and Superconducting Properties in the (Bi, Pb)-Sr-Ca-Cu-O System

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Abstract
An oxide superconductor in the (Bi, Pb)-Sr-Ca-Cu-O system has been prepared by the sol-gel method. The effects of heating schedule and starting compositions on the growth rate of the high-T c phase and on the microstructure and superconducting properties of the obtained samples have been examined. It was found that a higher volume fraction increase rate of the high-T c phase makes the grains smaller and T c(end) lower. In other words, by forming the high-T c phase with lower volume-fraction increase rates, superconducting bodies possessing high-T c values have been obtained.