Phase compatibility and superconductivity of Y-Ba-Cu-O compounds

被引：0
|
作者：
Wadayama, Yoshihide [1 ]
Kudo, Kotaro [1 ]
Nagata, Akihiko [1 ]
Ikeda, Keisuke [1 ]
Hanada, Shuji [1 ]
Izumi, Osamu [1 ]
机构：
[1] Tohoku Univ, Japan
来源：
Japanese Journal of Applied Physics, Part 2: Letters | 1988年 / 27卷 / 07期
关键词：
Ceramic Materials - Oxides - Superconductivity;
D O I：
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学科分类号：
摘要：
Superconducting properties of Y-Ba-Cu-O compounds were investigated in relation to precipitation of second phases. Contour lines of Jc, Tc and diamagnetic signal intensities were presented in the YO1.5-BaO-CuO system. These superconducting properties decreased steeply with BaCuO2 precipitation, and the maximum Jc was obtained in the yttrium-rich composition of Y1.2Ba2Cu3O7-y. It is considered, therefore, that the BaCuO2 precipitating around the YBa2Cu3O7-y grains interrupt the superconducting current pass at the grain boundary. Yttrium-rich composition, which inhibits BaCuO2 precipitation, is effective for the preparation of the high-Jc sample.
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