Abstract
We present a combined57Fe Mössbauer/X-ray diffraction (Rietveld analysis) study carried out on an In16Fe8S32spinel before and after chemical lithium insertion. To accommodate the new inserted cations in the structure, two mechanisms are observed. First, for a low lithium content, a cation migration takes place from the usually occupied 8aand 16dsites toward the usually unoccupied 8band 16csites, with distortion of the sulfur coordination polyhedra. Second, for a high lithium content, when both 16cand 16doctahedral sites are occupied, a decrease of the distortion of the polyhedra is observed. During the insertion process, no clear reduction of Fe atoms is observed but there is an increase in the covalent character of the Fe–S bonds.
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