| 摘要 |
PURPOSE:To obtain a material having high magnetic permeability up to high frequency (to 500kHz) and a lower loss. CONSTITUTION:In Mn-Zn based ferrite, CaO 0.05 to 0,12wt.%, Bi2O3 0.04wt.% or less (however unincluding 0wt.%), and SiO2 0.01 to 0.02wt.% (however unincluding 0.01wt.%) are included to burn under burning conditions of oxygen concentration 1% or less at 1250 to 1350 deg.C, having high frequency and high initial magnetic permeability. |
