STRUCTURAL, MAGNETIC, AND OPTICAL-PROPERTIES OF CO(II) IN COXCD1-XIN2S4 SPINEL SOLID-SOLUTIONS

The cation distribution of several CoxCd1-xIn2S4 spinel solid solution s prepared in the solid state with different x values (0, 0.05, 0.1, 0 .2, 0.4, 0.6, 0.8, and 1.0) has been studied by diffuse reflectance sp ectroscopy, magnetic susceptibility, lattice parameter variation, and analysis of some X-ray reflections whose intensities are particularly sensitive to variation in the cation positions. The results drawn from the combination of the four techniques indicate that Co2+ is present in both the octahedral and tetrahedral sites of the spinel structure a nd that the fraction of octahedral cobalt increases with the compositi on x, reaching the maximum value of 90% in CoIn2S4. (C) 1995 Academic Press, Inc.