W. Nowicki, J. Darul, P. Piszora, C. Baehtz, E. Wolska
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Synchrotron X-ray diffraction study on the cation distribution in quaternary Li-Fe-Mn spinel oxides
Single phase spinel solid solutions of LixMn3-x-yFeyO4 series with range of 0.5≤x≤1.0 and 0.2≤y≤1.0, have been synthesized by a solid state reaction. By refining the high-resolution X-ray diffraction patterns with Rietveld profile analysis, the lattice parame- ters, interatomic distances and cation distribution were determined. The Fe-for-Mn substitu- tion increases the spinel unit cell constant from a = 8.27A to a = 8.38A, for the Fe/(Fe+Mn) mole ratio of 0.1 and 0.472, respectively. Evidence is given that the lithium ions occupy the tetrahedral sites exclusively, for the molar ratio 0� Fe/(Mn+Fe) � 0.3.
期刊介绍:
Zeitschrift für Kristallographie International journal for structural, physical, and chemical aspects of crystalline materials ISSN 0044-2968 Founded in 1877 by Paul Groth Zeitschrift für Kristallographie is one of the world’s oldest scientific journals. In original papers, letters and review articles it presents results of theoretical or experimental study on crystallography.