Manganese reactivity in the synthesis of magnetoresisting complex oxides

被引：4

作者：

Chezhina, N ^{[1
]}

Mikhailova, M ^{[1
]}

Osipova, A ^{[1
]}

机构：

[1] St Petersburg State Univ, Dept Chem, St Petersburg 198904, Russia

来源：

SOLID STATE IONICS | 2001年 / 141卷

关键词：

solid solutions; magnetic susceptibility; effective magnetic moment; exchange parameter; chemical compounds; La0.67Ca0.33MnO3; La1-0.33xCa0.33xMnxAl1-xO3;

D O I：

10.1016/S0167-2738(01)00787-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

To study the superexchange interactions in 'giant magnetoresistors'-manganites with perovskite structure, diluted solid solutions of La0.67Ca0.33MnO3-LaAlO3 were prepared on the basis of MnO2 and Mn2O3. Examination of temperature and concentration dependencies of paramagnetic susceptibility and effective magnetic moment showed a strong tendency of manganese atoms to clustering in the solutions. The clusters are linked by ferromagnetic superexchange with an exchange parameter varying with temperature, which correlates with the unusual electrophysical properties of pure oxides and can be accounted for by varying the superexchange angles Mn-O-Mn with temperature. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：617 / 621

页数：5

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