| 摘要 |
PROBLEM TO BE SOLVED: To obtain an Mn-Zn ferrite, which is grown in crystal grains under control to be improved in permeability without deteriorating its impedance. SOLUTION: Oxide magnetic material powder is composed of main components, consisting of 52.0 to 53.0 mol% Fe2O3, 19.0 to 23.5 mol% ZnO, and residual mol% MnO and auxiliary components consisting of 0.005 to 0.025 wt.% SiO2, 0.02 to 0.07 wt.% CaO, and 0.01 to 0.03 wt.% Bi2O3, where the contents of the auxiliary components are set corresponding to the main component of 100 wt.%. The material powder is loaded with a reducing agent and sintered. Using this setup, the oxygen partial pressure of the sintered body is reduce inside, and voids inside the sintered body are set at 1.0 to 1.5 μm in average diameter, so that the growth of crystal grains is accelerated. |
