THE EXTENT OF CRITICAL-TEMPERATURE VARIATIONS OF THE SUPERCONDUCTING PHASES IN THE BI-PB-SR-CA-CU-O SYSTEM

被引：10
|
作者：
SARKAR, AK
MAARTENSE, I
机构：
[1] University of Dayton, Research Institute, 300 College Park, Dayton
来源：
SOLID STATE COMMUNICATIONS | 1991年 / 77卷 / 02期
关键词：
D O I：
10.1016/0038-1098(91)90870-2
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Bulk specimens having nominal composition of Bi2-xPb(x)Sr2Ca2Cu3O(y) (x = 0, 0.2, and 0.4) were subjected to various annealing and post-sinter cooling treatments to alter the oxygen stoichiometries and the granular critical temperature (T(c)) values of the superconducting phases. T(c) was found to vary from 53 K to 93 K in the 2212 phase and from 100 K to 108 K in the 2223 phase, depending on the processing. The shifts in the T(c) values of the two phases were not always in opposite directions as reported by others. Inferior intergranular coupling resulted when Ca2PbO4 precipitated into the grain boundaries during oxygen cooling, if the lead content was high (x = 0.4). The implications of these processing parameters on the bulk superconductive properties of this system are discussed.
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页码：121 / 124
页数：4
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