STRUCTURAL, MAGNETIC, AND OPTICAL-PROPERTIES OF Co(II) IN CoxCd(1-x)In2S4 SPINEL SOLID-SOLUTIONS

The cation distribution of several CoxCd(1-x)In2S4 spinel solid solutions 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 spectroscopy, 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 and that the fraction of octahedral cobalt increases with the composition x, reaching the maximum value of 90% in CoIn2S4