| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oxide magnetic material having high saturation magnetic flux density and high permeability in which increase in core loss is suppressed in the range of room temperature to 140°C or at high temperature of 100°C or above by containing CuO as a principal component. <P>SOLUTION: Low loss is ensured up to high frequency near several hundreds kHz by setting the density of sintered body at 4.95 g/cc or above and the crystal grain sizes in the range of 10-15 μm in an oxide magnetic material comprising 52.0-56.0 mol% of iron oxide in terms of Fe<SB>2</SB>O<SB>3</SB>, 8.0-13.0 mol% of zinc oxide in terms of ZnO, 0-5.0 mol% (0 is excluded) of copper oxide in terms CuO, as principal components, and the remainder of manganese oxide (MnO), and 0.005-0.05 wt.% of silicon oxide in terms of SiO<SB>2</SB>, 0.01-0.1 wt.% of calcium oxide in terms of CaO, 0.01-0.5 wt.% of niobium oxide in terms of Nb<SB>2</SB>O<SB>5</SB>, and 0.01-0.5 wt.% of cobalt oxide in terms of CoO, as secondary components. <P>COPYRIGHT: (C)2008,JPO&INPIT |
