CHARACTERIZATION OF CA-DOPED BI2+XSR2-XCUOZ

被引：9

作者：

SINCLAIR, DC

IRVINE, JTS

WEST, AR

机构：

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1991年 / 1卷 / 01期

关键词：

INCOMMENSURATE STRUCTURE; BI-SR-CU-O SYSTEM; OXIDE SUPERCONDUCTOR;

D O I：

10.1039/jm9910100147

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The 'R' phase in the Bi-Sr-Cu-O system, which is actually a solid solution of formula Bi2+xSr2-xCuOz, forms an extensive solid solution by partial substitution of Ca for Sr. This has formula, Bi2+xSr2-x-yCayCuOz, with 0 < y less-than-or-similar-to 0.45 and 0.15 less-than-or-similar-to x less-than-or-similar-to 0.40 at 800-degrees-C Lattice parameters of the solid solutions are given; pseudotetragonal symmetry is retained throughout but the incommensurate superstructure becomes less marked with increasing contents of both Ca and Bi. The excess oxygen content of the solid solutions, determined by iodometry, is unchanged by replacement of Sr by Ca, but for a given composition, can be varied by heating at 750-degrees-C in different atmospheres.

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页码：147 / 148

页数：2

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