Bi系酸化物超伝導の粒成長と超伝導特性

概要

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By using five differnt kinds of Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06Oy powders named No.0. No.1. No.2. No.7 and No.26 whose particle size is smaller in the sequence No.0-No.1-No.2-No.7-No.26. the influence of powder particle size on the grain size of the sintered specimen, the amount of high Tc phase and superconductive property has been investigated. Contrary to the particle size of powders, the grain size of the sintered specimens became larger in the sequence No.0-No.1-No.2-No.7-No.26, and especially in No.7 and No.26 specimens, the abnormal grain growth was observed. Whereas both volume fraction of high Tc phase and Tc temperature of No.7 and No.26 specimens were much lower than those of No.0. No.2 and No.2. those peoperties were remarkably improved by regrinding, repressing and resintering.