| 摘要 |
<p>The initial permeability of a manganese-zinc ferrite in the high-frequency zone of 10-500 Khz is improved by mixing a manganese-zinc ferrite comprising 50-56 mole % of Fe2O3, 22-39 mole % of Mno and 8-25 mole % of Zno with at most 800 ppm (in terms of Bi2O3) of bismuth oxide component and at most 1,200 ppm (in terms of MoO3) of molybdenum oxide component and firing the mixture. The mean crystal grain diameter is adjusted to 5-50 νm or less.</p> |
