Abstract
Saturation magnetisation, Curie temperature and initial permeability of Sn/Nb substituted Mn–Zn ferrites have been studied at room temperature. The influence of high valency cations on the microstructure has been studied. Grains of monodomain form are obtained and the variation of initial permeability with grain size is discussed in the light of recent studies on Mn–Zn ferrites, where initial permeability variation with grain size was explained on the basis of the Pankert model. The variation of saturation magnetisation and Curie temperature with dopant cation concentration is explained.
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