Ferrimagnetic Compositions in the System Fe1+<i>x</i>Cr2−<i>x</i>S4

Abstract

Materials in the system Fe2+Fex3+Cr2−xS4 have been prepared between x=0 and x=0.5. All of the compositions form with the spinel structure. Curie temperatures increase with increasing Fe3+ from 180°K for FeCr2S4 to 302°K for Fe12+Fe0.53+Cr1.5S4. Magnetic data suggest an ionic distribution of Fe1−x2+Fex3+[Fex2+Cr2−x]S4. From low-temperature resistivity measurements, it appears that all of the materials are semiconductors.