EFFECT OF MN VALENCE ON CRYSTAL-STRUCTURE OF LA-MN-O PEROVSKITE OXIDES

被引：31

作者：

YAO, T

ITO, T

KOKUBO, T

机构：

[1] Graduate School of Engineering, Kyoto University, Yoshida-Honmach

来源：

JOURNAL OF MATERIALS RESEARCH | 1995年 / 10卷 / 05期

关键词：

D O I：

10.1557/JMR.1995.1079

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

La:Mn = 1:1 mixtures of lanthanum oxide and manganese carbonate were heat-treated under various oxygen partial pressures at 1400 degrees C or 1300 degrees C. The Mn valence of the samples was measured by a chemical analysis, and the crystal structures were refined by the powder x-ray diffraction and the Rietveld analysis. A novel orthorhombic perovskite phase, belonging to the space group Pbnm and containing Mn2+ ions, was formed by heat-treatment under low oxygen partial pressures. The structure was very close to a cubic symmetry. It is supposed that the micro Jahn-Teller effects of Mn2+ ions were nearly canceled by one another.

引用

页码：1079 / 1082

页数：4

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