LOW-LOSS OF FINE-GRAINED MN-ZN FERRITE

Mn-Zn ferrite with grain size of 1.5 mu m was obtained by sintering hy drothermal-precipitated powders with uniform dispersion of additions. The fine grain size and high density were realized simultaneously by t he use of fine particle ferrite powder and fine particle additives, pl anetary ball mill mixing of MnZn ferrite powder and additives and low temperature sintering. The core loss of a newly developed ferrite with fine grain was significantly reduced to that of a commercial ferrite.