The presence of small amounts of Fe2+ ion in nickel zinc ferrite significantly influences some of its magnetic properties. The lattice parameter increases slightly and the increase Δa is independent ofx. The variation of magnetization with zinc concentration is explained on the basis of the Yafet-Kittel model. Increase in the Néel temperature on Fe2+ substitution in ZnxNi1-xFe2O4 is remarkable. This has been explained on the basis of a four sublattice model. Our analysis shows thatJAB (d5-d5) interaction is most affected. The influence of Fe2+ ions on the relaxation processes in the Mössbauer line shapes of Ni-Zn ferrite is also investigated and is compared with Cu2+ doped Ni-Zn ferrite.
Volume 43, 2020
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