Ferrimagnetic Compositions in the System Fe1+xCr2−xS4

Abstract

Materials in the system Fe²⁺Fe_x³⁺Cr_2−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⁺Fe_0.5³⁺Cr_1.5S₄. Magnetic data suggest an ionic distribution of Fe_1−x²⁺Fe_x³⁺[Fe_x²⁺Cr_2−x]S₄. From low‐temperature resistivity measurements, it appears that all of the materials are semiconductors.