Abstract
The microstructure of Mn-Zn ferrite on MoO3 addition was studied. It was found that although MoO3 addition expanded the diameters of crystalline grains, it also promoted porosity, thereby impeding grain growth. When the amount of MoO3 was increased, the grain diameter expanded, peaked, and then gradually declined under the influence of the porosity. It is important to note that it forms a fine microstructure that has large grains and a low level of porosity. We studied the effect of the sintering parameters−sintering time, heating rate, and oxygen partial pressure−on the microstructure of the ferrite. As a result, we obtained a high-initial-permeability Mn-Zn ferrite with μiac = 24,400.
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