TRANSFORMATION OF 2212-PHASE TO 2223-PHASE IN THE BI-SR-CA-CU-O SYSTEM

被引：7

作者：

PADAM, GK

TRIPATHI, RB

SHARMA, M

SURI, DK

RAO, SUM

NAGPAL, KC

DAS, BK

机构：

[1] National Physical Laboratory, New Delhi

来源：

SOLID STATE COMMUNICATIONS | 1991年 / 80卷 / 04期

关键词：

D O I：

10.1016/0038-1098(91)90022-N

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Single phase Bi2Sr2Ca1Cu2O8 (2 2 1 2) superconductor with T(c)-degrees around 85 K was transformed to nearly a single phase Bi2Sr2Ca2Cu3O10 (2 2 2 3) having T(c)-degrees around 115.5 K by reacting at 860-degrees-C with CaO and CuO (1 mol each of CaO and CuO, per formula composition Bi2Sr2Ca1Cu2O8) with addition of Pb for stabilization. A sample prepared under identical conditions but using the Bi2Sr2Ca2Cu3Oy nominal composition, however, showed only a very small amount of 2 2 2 3 phase with T(c)-degrees around 107 K. The corresponding changes in the superconducting phases and morphologies were also systematically investigated and found that uniform and sufficient supply of Ca and Cu ions in the correct proportions at early stages in the processing might have led to a key role during the subsequent 2 2 1 2-2 2 2 3 phase transformation.

引用

页码：271 / 275

页数：5

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