Abstract
The effect of addition of Ti4+ in small amounts (1/2, 1, 2, 5, 10% by weight of TiO2) under oxidising conditions on magnetisation, Mossbauer spectra and resistivity of Ni0·3Zn0·7Fe2O4 is studied. Analysis of the magnetic data on the basis of 3 sublattice Yafet-Kittel model gives the transfer rate of Fe3+ ions between theA andB sublattices, the distribution of Ti4+ and vacancies between them and the five exchange constants of Ni-Zn ferrite. The observed Mossbauer spectra at room temperature are quadrupole doublets and those at liquid nitrogen temperature are magnetic sextets with large relaxation effects. The resistivity shows an increase by about two orders of magnitude due to Ti4+ addition.
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