Crystal structures of the double perovskites Ba2Sr1-xCaxWO6

被引：23

作者：

Fu, W. T. ^{[1
]}

Akerboom, S. ^{[1
]}

IJdo, D. J. W. ^{[1
]}

机构：

[1] Leiden Univ, Leiden Inst Chem, Gorlaeus Labs, NL-2300 RA Leiden, Netherlands

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2007年 / 180卷 / 05期

关键词：

perovskites; X-ray powder diffraction; crystal structure; X-RAY; LN; LA; TUNGSTATES; SYMMETRY; PR;

D O I：

10.1016/j.jssc.2007.03.008

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Structures of the double perovskites Ba(2)Srl-,Ca,WO6 have been studied by the profile analysis of X-ray diffraction data. The end members, Ba2SrWO6 and Ba2CaWO6, have the space group I2/m (tilt system a(0)b(-)b(-)) and Fm (3) over barm (tilt system a(0)a(0)a(0)), respectively. By increasing the Ca concentration, the monoclinic structure transforms to the cubic one via the rhombohedral R (3) over bar phase (tilt system a(-)a(-)a(-)) instead of the tetragonal I4/m phase (tilt system a(0)a(0)c(-)). This observation supports the idea that the rhombohedral structure is favoured by increasing the covalency of the octahedral cations in Ba2MMO6-type double perovskites, and disagrees with a recent proposal that the formation of the pi-bonding, e.g., d(0)-ion, determines the tetragonal symmetry in preference to the rhombohedral one. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：1547 / 1552

页数：6

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