BULK SINGLE-SUPERCONDUCTING-PHASE THALLIUM-2234 SUPERCONDUCTOR-TL2-XBA2CA3+XCU4O12-DELTA

被引：19

作者：

PRESLAND, MR ^{[1
]}

TALLON, JL ^{[1
]}

GILBERD, PW ^{[1
]}

LIU, RS ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,IRC SUPERCONDUCT,CAMBRIDGE CB3 0HE,ENGLAND

来源：

PHYSICA C | 1992年 / 191卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(92)90923-Z

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Bulk single-superconducting-phase thallium 2234 superconductor, Tl2-xBa2Ca3+xCu4O12-delta is synthesized by allowing for calcium substitution in the thallium site, using a 2245 composition in the precursor and reacting for several minutes at almost-equal-to 900-degrees-C followed by a 1 to 2 h anneal at almost-equal-to 850-degrees-C. The compounds, as synthesized, show a single sharp diamagnetic transition at 113 K which can be increased by oxygen loading or prolonged vacuum annealing to 116 K. Further increase is prevented by decomposition. Electron beam X-ray analysis shows a tendency for calcium substitution on the thallium site to remain fixed at x almost-equal-to 0.30, irrespective of starting composition. We propose that in both 2223 and 2234, vacuum annealing slowly increases this fraction resulting in hole doping and an increase in T(c).

引用

页码：307 / 315

页数：9

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