STRUCTURAL DISORDER IN YSR2CU2COO7 AND SUBSTITUTED VARIANTS

被引：5

作者：

BABU, TGN

KILGOUR, JD

SLATER, PR

GREAVES, C

机构：

[1] Superconductivity Research Group, School of Chemistry, University of Birmingham, Birmingham

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1993年 / 103卷 / 02期

关键词：

D O I：

10.1006/jssc.1993.1125

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The phase YSr2Cu2CoO7 (orthorhombic, Ima 2) is structurally related to YSr2Cu2GaO7, but has a component of disorder associated with the oxygen sublattice. Substitutions of small amounts of Ba for Sr, or Cu for Co, have been studied, and shown by powder diffraction methods to increase the level of disorder, YSr1.8 Ba0.2Cu2CoO7 and YSr2Cu2.25Co0.75O7, for example, have been shown by neutron diffraction to have tetragonal symmetry (P4/mmm), which appears related to significant displacements of some of the oxygen ions. The nature of the disorder in the parent phase is discussed and compared with the structural observations on substituted derivatives. © 1993 Academic Press, Inc.

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页码：472 / 480

页数：9

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