粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
La2-xBixCuO4の合成と超伝導
武田 保雄佐藤 敦今西 誠之山本 治広井 善二高野 幹夫坂東 尚周
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1991 年 38 巻 8 号 p. 1001-1004

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La2-xBixCuO4+z (0<x<0.2) was prepared under oxygen pressures between 1bar and 0.5kbar. The solid solution La2-xBixCuO4+z showed superconductivity only after being annealed under high oxygen pressure. For La2CuO4+z the superconducting transition temperature, Tc, was almost independent of z at around 40K, while the Tc of Bi-doped samples showed a strong dependence. The superconductive volume fraction was considersbly increased by the Bi doping. The known phase separation into nearly stoichiometric La2CuO4 and superconducting La2CuO4+z seems to be suppressed by the Bi-for-La substitution.
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