Synthesis and cation distribution of copper-substituted spinel-related lithium ferrite

Widatallah, H.M.; Johnson, C.; Berry, Frank; Gismelseed, A.M.; Jartych, E.; Marco, J.F.; Gard, F.S. and Pekala, M. (2006). Synthesis and cation distribution of copper-substituted spinel-related lithium ferrite. Journal of Physics and Chemistry of Solids, 67(8) pp. 1817–1822.



Single-phased Cu2+-substituted spinel-related Li0.5Fe2.5O4 was synthesized by sintering a mixture of Cu2+-substituted corundumrelated alpha-Fe2O3 and Li2CO3 at 700 degrees C which is similar to 325-400 degrees C lower than the temperature at which the material is prepared by the conventional ceramic methods. X-ray powder diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy and magnetic measurements were used to characterize the material. In contrast to high-temperature synthetic routes, the present one leads to a Cu+ and Fe2+-cation free material, thereby optimizing its technological value. Rietveld refinement of the XRD data favors a structural model in which Cu2+ substitutes for both Fe3+ and Li+ at the octahedral sites. Mossbauer and magnetic data are consistent with this model if spin thermal reversal and/or spin canting are taken into account for the later.

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