CATION CHEMISTRY AND PHASE-RELATIONS IN THE SUPERCONDUCTING BI-PB-CA-SR-CU-O SYSTEM

被引：8
|
作者：
SCHWARTZ, KB
THOMPSON, MS
LEONG, DB
MCCONVILLE, RL
机构：
[1] Raychem Corporation, Menlo Park, CA 94025
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1990年 / 51卷 / 10期
关键词：
analytical electron microscopy; Bi-Pb-Ca-Sr-Cu oxides; cation chemistry; phase transitions; Superconductors;
D O I：
10.1016/0022-3697(90)90104-N
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The cation chemistry and magnetic susceptibility of a suite of samples in the superconducting (Bi,Pb)2Can -1Sr2CunOx system have been studied at various stages during their evolution from the two-layer to the high Tc three-layer polytype. Relationships between phase assemblage and cation chemistry have been identified in both relatively pure and interlayered samples. The Ca/Sr ratio is an important indicator of the relative proportion of the 30 and 37 Å phases. The cation defect structure of these (Bi,Pb)2Can - 1Sr2CunOx superconductors includes significant vacancies on the Bi and possibly the Sr layers. High cation vacancy concentrations, particularly in the two-layer-dominant material formed at early stages in processing, may play a key role during the subsequent two-layer → three-layer phase transformation. © 1990.
引用
收藏
页码：1217 / 1226
页数：10
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