THE HYPERFINE FIELD DISTRIBUTION IN COPPER-CADMIUM FERRITES STUDIED BY MOSSBAUER AND NMR SPECTROSCOPIES

Hyperfine fields have been studied at liquid nitrogen temperature in C dxCu1-xFe2O4 (0 less than or equal to x less than or equal to 0.5) fer rites by Mossbauer and NMR spectroscopies. The distributions of the hy perfine fields at iron sites, caused by substitution of cadmium for co pper, are observed both in the tetrahedral and octahedral crystal subl attices. In both sublattices the values of the averaged hyperfine fiel d decrease with increasing cadmium concentration. The hyperfine field distributions and size reductions are more pronounced in the octahedra l sublattice than in the tetrahedral one. They are explained by differ ent statistical distributions of the metallic cations within the tetra hedral and octahedral crystal sublattices. The Mossbauer effect and NM R data are in a good agreement each with other.