| 摘要 |
PURPOSE:To attain exellent magnetic characteristics without producing abnormal crystal formation, by adding CaO, and one kind of alkali metals, alkaline earth metals, and silicate of Zr or Al of predetermined amounts into principal composition consisting of Fe2O3, MnO, ZnO of predetermined proportions, and by fine- grinding, molding, and sintering them. CONSTITUTION:After CaO of 0.01-0.2wt% and one kind of alkali metal,s alkaline earth metals, and silicate of Zr or Al of 0.005-0.2wt% are added into calcined raw material of principal composition consisting of FeO3 of 50-70mol %, MnO of 10-40mol%, and ZnO of 5-30mol%, they are fine-ground, molded, and sintered. CaO is added for the purpose of providing low magnetic loss. Adding one kind of a alkali metals, alkaline earth metals, and silicate of Al or Zr can prevent large-size crystal formation which would be produced by being added in the form of SiO2, and can attain excellent magnetic characteristics. |
