The ferrites of PC30 (Mn-Zn ferrites) were prepared by using a dry processing route. The effect of Mn-Zn ferrites doped with H_3BO_3 was investigated on the basis of microstructure analysis. The results of the samples doped with H_3BO_3 less than 5 ×10~(-5) showed that the doping had no significant effect on power loss, initial permeability, fine grain microstructure, and density of Mn-Zn ferrites. With the further increase in H_3BO_3 doping (up to 1 × 10~(-4)), the microstructure of Mn-Zn ferrites is in the critical state between fine grain and "sandwich", and the initial permeability and density of Mn-Zn ferrites begin falling quickly; the increased H_3BO_3 doping also results in deterio-rated power loss properties. Thus, the control of the boron content in iron oxide is of utmost importance for the quality of Mn-Zn ierrites in producing process.
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