Bi-Pb-Sr-Ca-Cu-O系セラミックスの焼結および超伝導特性におよぼす粉末粒度の影響

概要

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By using six different kinds of Bi0.7 Pb0.3 Sr1.0 Ca1.0 Cu1.8 Oy powders named A-E whose particle size is smaller in the sequence B-A-D-C(30)-C(60)-E and one kind of Bi1.8 Pb0.3 Sr1.9 Ca2.0 Cu3.0 Oy powder named F whose particle size is almost similar to that of B powder, the influence of particle size on the amount of high Tc phase or superconductive property has been investigated. Whereas the formation of high Tc phase in Bi0.7 Pb0.3 Sr1.0 Ca1.0 Cu1.8 Oy specimen was accelerated by using the smaller particle size powder, any remarkable relationship be-tween superconductive property and particle size was not observed. On the other hand, the Bi1.8 Pb0.3 Sr1.9 Ca2.0 Cu3.0 Oy specimen showed both of high volume fraction of high Tc phase and the improved superconductive property. The sintered density of the Bi0.7 Pb0.3 Sr1.0. Ca1.0 Cu1.8 Oy specimen once increaced in the shorter sintering period than 24h, and decreased in the longer sintering period. However the Bi1.8Pb0.3 Sr1.9 Ca2.0 Cu3.0 Oy specimen showed only decreasing tendency of sintered density even in the shorter sintering period.