Bi-Ca-Sr-Cu-O系高温超伝導酸化物のガラス化および結晶化過程(ガラス化・アモルファス化・結晶化)(<特集>ガラス・アモルファス材料及びその材料科学の進展)

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In a relatively wide region of the pseudoternary system BiO_<3/2>-(CaO・SrO)_<l/2>-CuO, CaO/Sr0=1,glassy samples have been obtained by the rapid-quenching technique. The glass transition temperature in this system was found to be mainly dependent on the BiO_<3/2> content, with a maximum of 390℃ at around 20 mol% BiO_<3/2> The crystallization of the glasses of proper compositions such as BiCaSrCu_2O_x and Bi_2Ca_2Sr_2Cu_30_x produced superconductors consisting mainly of the low-Tc(80 K) phase ; this superconducting phase grew gradually with increasing heat-treatment temperature. The critical temperature Tc (zero) was 86 K for Bi_2Ca_2Sr_2Cu_30_x, whereas it can be expected to be increased by optimizing the heat-treatment conditions and/or using appropriate additives.
社団法人日本セラミックス協会の論文
1989-03-01