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• W1970602960 endingPage "1381" @default.
• W1970602960 startingPage "1377" @default.
• W1970602960 abstract "EPR of Mn4+ has been used to specify the electronic structure and cation distribution in LiCoMnO4 compositions that belong to high-potential electrode materials. To prepare single phase LiCoMnO4, two synthesis techniques have been adopted: solid state reactions and a lactate precursor method. EPR of Mn4+ shows that diamagnetic Co3+ (low-spin configuration, S = 0) and paramagnetic Mn4+ (S = 3/2) account for the electronic structure of LiCoMnO4. Analysis of the EPR line width in terms of dipole–dipole and exchange interactions allows one to estimate the mean number of paramagnetic neighbours of Mn4+. It has been demonstrated that the Co3+/Mn4+ distribution in 16d spinel sites is sensitive towards the cooling rates. For the high-temperature LiCoMnO4 phase obtained by air quenching from 750 °C, three paramagnetic Mn4+ and three diamagnetic Co3+ give rise to the local coordination of Mn4+, indicating a random Co/Mn distribution. For the low-temperature LiCoMnO4 phases obtained by air quenching from 600 °C and by slow-cooling from 750 to 25 °C, the mean paramagnetic number of Mn4+ decreases from 3 to 2, which is interpreted in the framework of short-range Co3+/Mn4+ ordering. The Co3+/Mn4+ octahedral ordering process is developed within a small-scale range (approximately up to a distance of the third metal shell) and does not affect the cubic spinel symmetry of LiCoMnO4." @default.
• W1970602960 created "2016-06-24" @default.
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• W1970602960 date "2000-01-01" @default.
• W1970602960 modified "2023-09-26" @default.
• W1970602960 title "EPR evidence on short-range Co/Mn order in LiCoMnO4 spinels" @default.
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• W1970602960 doi "https://doi.org/10.1039/a909066e" @default.
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