Abstract
Systematic studies of the changes in microstructure and the grain-growth kinetics of iron-deficient and iron-excess Ni-Zn ferrites with varying contents of V2O5 have been undertaken. The basic composition of an iron-deficient Ni-Zn ferrite showed a duplex structure. Modified microstructures with pore-free and uniform grains were obtained on V2O5 doping. A regular increase in grain size was found with increasing V2O5 content both in iron-deficient and iron-excess compositions. The square of the average grain diameter varied linearly with sintering time up to 0.0 to 0.4 mol % V2O5. For higher V2O5 contents (0.6 to 1.0 mol %), the cube of the average grain diameter was directly proportional to the sintering time. Modifications in the microstructure and the grain growth have been explained in terms of the solubility of V2O5 in the lattice and liquid-phase formation at the grain boundaries.
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