| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide NiCuZn ferrite which can make initial permeability large in high-frequency range and is preferably applicable to applications in the high-frequency range. <P>SOLUTION: The composition of the NiCuZn ferrite contains ≥47 mol% to ≤50 mol% iron oxide, ≥17.5 mol% to ≤25.5 mol% nickel oxide, ≥9 mol% to ≤19 mol% zinc oxide and the balance copper oxide as essential constituents and ≥0.5 wt.% to ≤7 wt.% bismuth oxide and ≥0.3 wt.% to ≤1.5 wt.% silicon oxide as accessory constituents. The sintered body obtained from the composition works so that the characteristics of each mixed material is mutually functioned and has the initial permeability μ<SB>i</SB>of ≥25 in 200 MHz frequency as a characteristic of the material. Since silicon oxide is added with bismuth oxide as the accessory constituent, it forms uniform dispersion in a crystal boundary, the firing at relatively low temperature contributes to suppress the average particle diameter after firing to about 1 μm and as a result, the high-frequency characteristics are excellently attained. <P>COPYRIGHT: (C)2010,JPO&INPIT |
