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

✍ Scribed by R Stoyanova; M Gorova; E Zhecheva

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
189 KB
Volume
61
Category
Article
ISSN
0022-3697

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✦ Synopsis

EPR of Mn 4ϩ has been used to study electron-phonon interactions and cation distribution in Li 1ϩx Mn 2Ϫx O 4 spinels with 0 Յ x Յ 0:1: The EPR spectra of Mn 4ϩ in 16d spinel sites has been interpreted in terms of the bottleneck-relaxation mechanism. Two additional weak signals were registered that were attributed to Mn 4ϩ ions located near oxygen vacancies and to Mn 4ϩ ions in a lithium rich environment. These Mn 4ϩ defects are sensitive towards the Li/Mn ratio and the cooling rate. It has been demonstrated that EPR monitoring of Mn 4ϩ allows us to distinguish more precisely the Li 1ϩx Mn 2Ϫx O 4 spinels with respect to the cation distribution.

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