Patent ID: 6183659
Filing Date: 2001-02-06
Classification: C04B,H01F

Abstract:
A ferrite oxide magnetic material containing basic composition and subsidiary components,said basic composition essentially consisting of:11 to 19 mol % of iron oxide calculated in terms of Fe.sub.2 O.sub.3 ;11 to 25 mol % of zinc oxide calculated in terms of ZnO;0 to 10 mol % of copper oxide calculated in terms of CuO; anda residual part of nickel oxide;said subsidiary components including:0.01 to 15 wt % of lead oxide calculated in terms of PbO; and0.01 to 15 wt % of at least one of silicon oxide and talc calculated in terms of SiO.sub.2 ;wherein said ferrite oxide magnetic material having an initial magnetic permeability of not higher than 8, a sintered density of not lower than 4.8 g/cm.sup.3 and a stress-resisting and magnetic-field-resisting characteristic in a range of .+-.5% calculated in terms of the rate .DELTA.L/L of the change of inductance due to the condition of a magnetic field of 1000 G under a compressive stress P=5 (kg/mm.sup.2) parallel with a direction of magnetization.