ゾル-ゲル法によるBi系銅酸化物超伝導膜の作製と評価 (酸化物超伝導物質と材料<特集>)

概要

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Bi-Pb-Sr-Ca-Cu-O superconducting films were prepared by Sol-Gel method using a solution of acetate and propionic acid. Starting solution with moler ratio of Bi2.2Pb0.4Sr2Ca2.2Cu3.2Oy was spin-coated onto poly-crystal MgO, single-crystal MgO and Ag substrate and then heated to decompose after drying in air. Films were prepared by repeating the process from the coating to the decomposition for 10 times and these were sintered at 840-855°C for 30min. Bulk samples were also prepared for comparison. In the case of bulk samples, percent of 2223 phase increased from 49% to 63% when the sintering temperature rised from 840°C to 855°C. On the other hand, in the case of film samples of sintered at 855°C, the percent of 2223 phase was 10% on poly-crystal MgO but 85% on single-crystal MgO. Film sample sintered at 840°C on Ag substrate was composed of single phase of 2212 phase.
社団法人粉体粉末冶金協会の論文