Abstract
The excess of Fe2O3 in MgZn ferrite sintered in air easily results in a discontinuous grain growth. On the other hand, ferrites with a deficiency of Fe2O3 in the stoichiometry tend to produce a uniform microstructure irrespective of the sintering atmosphere. The firing at low Po2 is highly effective in suppressing the discontinuous grain growth, and it precipitates the magnesiowustite accompanying the inhibition of grain growth. Highly pure ferrites with excess Fe2O3 never stimulate any discontinuous grain growth and result in a uniform microstructure. The formation of precipitates and liquid phase is correlation to the extent of the grain growth behavior of MgZn ferrite.
