MOSSBAUER STUDY OF MN-X(CU0.5FE0.5)(1-X)CR2S4

Mn-x(Cu0.5Fe0.5)(1-x)Cr2S4 has been studied by Mossbauer spectroscopy and X-ray diffraction. The crystal is found to have a cubic spinel str ucture, and the lattice constant increases with increasing Mn concentr ation. The iron ions are in ferric states and occupy the tetrahedral s ites. When the manganese concentration at the tetrahedral sites increa ses from 10 to 20%, the magnetic hyperfine field and the Neel temperat ure are found to decrease by 0.3 and 5%, respectively. As the interato mic distance increases by 0.2%, the Debye temperature decreases by 7%.