Ternary vanadium sulfides

Ternary vanadium sulfides, M x VS2 (M = Fe, Co, Ni), with x = 1 4 , 1 3 , and 1 2 , were prepared and studied. The x = 1 4 and x = 1 2 series are isostructural with V5S8 and V3S4, respectively, while compounds with x = 1 3 appear to have the hexagonal Cr2S3 structure. Structures of NiV2S4 and NiV4S8 were refined from powder X-ray diffraction intensities. Magnetic and electrical properties reveal that M ions in these sulfides exist in the divalent state having localized moments, while the vanadium 3 d electrons are itinerant.