| 摘要 |
A manganese-zinc ferrite which comprises iron oxide in an amount of 50 to 56 mol % in terms of Fe2O3, manganese oxide in an amount of 21 to 27 mol % in terms of MnO, and zinc oxide in an amount of 20 to 26 mol % in terms of ZnO, as main components, and further comprises phosphorus in an amount of 0.0003 to 0.003 wt %, as a minor component, and has an average crystal grain diameter more than 50 mu m and up to 200 mu m. The manganese-zinc ferrite exhibits a high magnetic permeability in a broad frequency band and a particularly high magnetic permeability in a frequency band around 10 kHz.
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