錯体重合法によるBi2Sr2Ca1-xYxCu2Oyの超伝導特性 (酸化物超伝導体の材料プロセス化と特性評価)

概要

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Superconducting Bi-Sr-Ca-Y-Cu-O ceramics have been synthe-sized by the polymerized complex method at the Bi2Sr2Ca1-xYxCu2Oy (0 ≤ x ≤ 0.4) compositions, and the dependence of the superconducting transition on the hole concentration was studied. The onset temperature of the superconducting transition Tc(onset) was carefully measured in terms of complex susceptibility. The onset temperature is enhanced as x increases up to x = 0.1 and then decreases as x further increases. Wet chemical analyses were carried out to determine the average charges of Bi and Cu ions. To interpret the results, we propose that the mixed valence of Bi+5 and Bi+3 acts as a charge reservoir for the Cu02 planes.
社団法人粉体粉末冶金協会の論文