EPR of Mn4+ in spinels Li1+xMn2-xO4 with 0 ≤ x ≤ 0.1

被引：56

作者：

Stoyanova, R ^{[1
]}

Gorova, M ^{[1
]}

Zhecheva, E ^{[1
]}

机构：

[1] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2000年 / 61卷 / 04期

基金：

新加坡国家研究基金会;

关键词：

lithium-manganese spinel oxides; electron paramagnetic resonance (EPR);

D O I：

10.1016/S0022-3697(99)00244-9

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

EPR of Mn4+ has been used to study electron-phonon interactions and cation distribution in Li1+xMn2-xO4 spinels with 0 less than or equal to x less than or equal to 0.1. The EPR spectra of Mn4+ in 16d spinel sites has been interpreted in terms of the bottleneck-relaxation mechanism. Two additional weak signals were registered that were attributed to Mn4+ ions located near oxygen vacancies and to Mn4+ ions in a lithium rich environment. These Mn4+ defects are sensitive towards the Li/Mn ratio and the cooling rate. It has been demonstrated that EPR monitoring of Mn4+ allows us to distinguish more precisely the Li1+xMn2-xO4 spinels with respect to the cation distribution. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：609 / 614

页数：6

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