The hyperfine field distribution in copper-cadmium ferrites studied by Mössbauer and NMR spectroscopies

Abstract Hyperfine fields have been studied at liquid nitrogen temperature in Cd x Cu 1− x Fe 2 O 4 (0 ⩽ x ⩽ 0.5) ferrites by Mossbauer and NMR spectroscopies. The distributions of the hyperfine fields at iron sites, caused by substitution of cadmium for copper, are observed both in the tetrahedral and octahedral crystal sublattices. In both sublattices the values of the averaged hyperfine field decrease with increasing cadmium concentration. The hyperfine field distributions and size reductions are more pronounced in the octahedral sublattice than in the tetrahedral one. They are explained by different statistical distributions of the metallic cations within the tetrahedral and octahedral crystal sublattices. The Mossbauer effect and NMR data are in a good agreement each with other.