On the synthesis and cation distribution of aluminum-substituted spinel-related lithium ferrite

Widatallah, H.M.; Johnson, C.; Berry, Frank; Jartych, E.; Gismelseed, A.M.; Pekala, M. and Grabski, J. (2005). On the synthesis and cation distribution of aluminum-substituted spinel-related lithium ferrite. Materials Letters, 59(8-9) pp. 1105–1109.

DOI: https://doi.org/10.1016/j.matlet.2004.12.017

Abstract

Spinel-related Al-substituted Li0.5Fe2.5O4 has been synthesized by sintering a mixture of Al-substituted corundum-related alpha-Fe2O3 and Li2CO3 at 700 degreesC which is ca. 450-500 degreesC lower than the temperatures normally used to prepare the material by conventional ceramic methods. The cation distribution in the material was investigated with X-ray diffraction, Mossbauer spectroscopy and magnetic measurements. Rietveld refinement of the X-ray diffraction data shows the Al3+ ions to substitute for both Fe3+ and Li+ ions on octahedral B-sites while the displaced Li+ ions substitute for Fe3+ ones at tetrahedral A-sites. This structural model is consistent with Mossbauer and magnetic data.

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