高T_c(110K級)Bi-Pb-Sr-Ca-Cu-O系超伝導薄膜の作製に及ぼす熱処理条件の影響

概要

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Bi-Pb-Sr-Ca-Cu-O thin films were prepared by the rf magnetron sputtering method using multi targets : Bi_<0.5>_Pb<0.5>O_x,CaCu_<0.75>O_x and SrCu_<0.75>O_x. The composition of the as-deposited film was (Bi+Pb) : Sr : Ca : Cu=1.47 : 1.00 : 0.92 : 1.80. High T_c films (T_c≧100 K) were synthesized by the 2-step annealing process ; preannealing at 720°-820℃ for short time (2 h) and annealing at 850℃ for 15 h. The obtained films contained a small amount (≦50%) of the high T_c phase as determined by XRD, but showed a high T_c (≧100 K). Long time preannealing increased the amount of the high T_c phase, but the temperature dependence of resistance showed the double step superconducting transition and no zero resistivity at temperature over 100 K. The grain boundary insulator phase is probably responsible for such behavior.
社団法人日本セラミックス協会の論文
1990-09-01