Pb置換2201相からのPb化合物の析出 : Pb-2223相との比較

概要

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Thermal behavior of the Pb-substituted Bi-2201 with various compositions was examined by XRD and SEM. Bulk samples were annealed in the temperature range from 600°C to 800°C and subsequently reheated at 750°C to 830°C in air. Various Pb-compounds precipitate by annealing in the temperature range from 600°C to 800°C and dissolution of the precipitates by subsequent reheating in the temperature range from 750°C to 830°C. The kind of the Pb-compounds and the temperature range in which these reactions occur depend upon the composition of the "2201" phase. The precipitation and dissolution of the Pb-compounds were confirmed with morphological observations with a SEM of a fixed portion of a sample before and after heat treatments. Remarkable grain-growth of the "2201" phase was observed in Bi1.7Pb0.8Sr1.5CuOz reheated at 750°C, indicating the formation of liquid.
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