NONSTOICHIOMETRY OF BAEU2MN2O7

被引：8

作者：

KAMEGASHIRA, N

ICHIKAWA, M

机构：

[1] Department of Materials Science, Toyohashi University of Technology, Toyohashi, 440, Tempaku-cho

来源：

MATERIALS CHEMISTRY AND PHYSICS | 1990年 / 25卷 / 01期

关键词：

D O I：

10.1016/0254-0584(90)90008-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxygen nonstoichiometry of BaEu2Mn2O7 phase was measured by thermogravimetric analysis at 1273 K under various oxygen partial pressures. It is found that this phase has an oxygen excess nonstoichiometry form x = 0 to 0.33 in BaEu2Mn2O7+x and this result is supported by the electrical conductivity measurement, which shows p-type semiconducting behavior. The electrical conductivity also suggested the existence of a phase transition near 550 K from the z-type jump in the conductivity curve for the orthorhombic phase, while the tetragonal phase shows no anomaly near this temperature region. A T-x phase diagram for BaEu2Mn2O7+x is schematically proposed. © 1990.

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页码：71 / 79

页数：9

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