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We investigated the influence of ZrO2on the microstructure and electromagnetic properties of MnZn ferrites by characterizing fracture surface micrographs, magnetic properties, and dc resistivity. Powders of Mn0.68Zn0.25Fe2.07O4composition were prepared by the conventional ceramic technique. Toroidal cores were sintered at 1350degC for 4 h in N2/O2atmosphere with 4% oxygen. The results show that the lattice constant and average grain size increase with ZrO2concentration, but excessive ZrO2concentration will result in exaggerated grain growth and porosity increase. The dc resistivity, activation energy, saturation magnetic flux density, and initial magnetic permeability increase monotonically when the ZrO2concentration is not more than 0.04 wt% and then decrease with further increase of ZrO2concentration. On the other hand, the porosity, drift mobility, resonance frequency, and core loss decrease initially and then increase with the increase of ZrO2concentration.
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Li et al. (2008) studied this question.
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