The Jahn-Teller distortion and cation ordering in the perovskite Sr2MnSbO6

被引：35
|
作者：
Cheah, Melina [1 ]
Saines, Paul J. [1 ]
Kennedy, Brendan J. [1 ]
机构：
[1] Univ Sydney, Ctr Struct Biol & Struct Chem, Sch Chem, Sydney, NSW 2006, Australia
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2006年 / 179卷 / 06期
基金：
澳大利亚研究理事会;
关键词：
ordered perovskite; Jahn-Tellar distortion; phase transition;
D O I：
10.1016/j.jssc.2006.03.013
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The perovskite Sr2MnSbO6 has been synthesized using conventional ceramic techniques and structurally characterized using high-resolution powder X-ray and neutron diffraction. The structure is tetragonal in space group 14/m. The octahedra were found to feature Jahn-Teller (JT) distortion due to the presence of Mn3+, and this is identified as strongly contributing to the octahedral tilting. Evidence for B-site cation ordering is presented however there is extensive anti-site disorder. The disordering of the Mn3+ and Sb5+ cations is believed to be a result of the similar size of these two cations and the polarizability of the Sb5+ cation. The structure was found to undergo a transition to cubic symmetry at 521 degrees C with removal of the octahedral tilting leading to the quenching of the JT distortion. This phase transition was found to be continuous and tricritical in nature. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码：1775 / 1781
页数：7
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