| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oxide magnetic material which has good properties, such as large high-frequency magnetic permeability similar to that of NiZn-based ferrite, and high surface resistance, and which is suitable for reduction in cost and used suitably as an alternate material for the NiZn-based ferrite. <P>SOLUTION: A composition including 50.1-54.4 mol% of iron oxide as a main component, 3.8-20.3 mol% of manganese oxide, 10.3-25.0 mol% of zinc oxide and 5-15 mol% of copper oxide, and the balance being magnesium oxide is prepared. Zirconium oxide may be added as an additive in an amount of about 0.5 wt.% or a trace amount smaller than 0.5 wt.%. In a sintered compact thus obtained, characteristics of respective mixed materials are made to interact, and the sintered compact has such material properties that the variation rate Δμ<SB>i</SB>/μ<SB>i</SB>of initial magnetic permeability μ<SB>i</SB>is <5% in the frequency range of 10-100 kHz and the surface resistance is ≥10<SP>7</SP>[Ω]. <P>COPYRIGHT: (C)2010,JPO&INPIT |
