BO33- SUBSTITUTIONS IN PHASES RELATED TO YBA2CU3O7 - SUPERCONDUCTING PROPERTIES OF (Y, CA) (BA, SR)2CU3-Z(BO3)ZOY

被引：35

作者：

SLATER, PR

GREAVES, C

机构：

[1] School of Chemistry, University of Birmingham, Birmingham

来源：

PHYSICA C | 1993年 / 215卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(93)90380-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of partially replacing Cu by borate anions in the system YSr2-xBaxCu3-z(BO3)zOy (YSr2-xBaCu3-zBzO7-delta) have been examined. The optimum substitution level to give single-phase samples was found to be z almost-equal-to 0.5. Borate-substituted samples of this composition were found to be non-superconducting as prepared, but superconductivity could be induced by the partial replacement of Y by Ca (for samples with 0.5 less-than-or-equal-to x less-than-or-equal-to 1.5), or by high oxygen pressure treatment (for 1.0 less-than-or-equal-to x less-than-or-equal-to 1.5). The highest T(c) onset recorded for a single-phase sample was 55 K for Y0.85Ca0.15Ba1.5Sr0.5Cu2.5B0.5O7 annealed in high pressure oxygen. The unit cell symmetry changes from orthorhombic for the Ba-free phase (x=0) to tetragonal at higher Ba contents, which appears to be associated with a randomisation of the orientations of the borate groups.

引用

页码：191 / 194

页数：4

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