Abstract
Fe 0.5Cu 0.5Cr 2Se x S 4− x (0 < x ≤ 2) has been studied by Mössbauer spectroscopy and X-ray diffraction. The crystal structure is found to be a cubic spinel and lattice constant a 0 increases linearly with increasing selenium concentration. The iron ions are ferric and occupy the tetrahedral sites. As interatomic distance increases by 1%, Néel temperature and magnetic hyperfine field decrease by 6 and 4%, respectively.
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