Structural and Local Environment Modifications in a Chemically Lithiated Iron Thiospinel

✍ Scribed by C. Bousquet; A. Krämer; C. Pérez Vicente; J.L. Tirado; J. Olivier-Fourcade; J.C. Jumas

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 340 KB
• Volume: 134
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7546

✦ Synopsis

We present a combined 57 Fe Mo¨ssbauer/X-ray diffraction (Rietveld analysis) study carried out on an In 16 Fe 8 S 32 spinel 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 8a and 16d sites toward the usually unoccupied 8b and 16c sites, with distortion of the sulfur coordination polyhedra. Second, for a high lithium content, when both 16c and 16d octahedral 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.