Mn-Zn ferrite and production process thereof
AssigneeMinebea Co., Ltd.
InventorsOsamu Kobayashi, Osamu Yamada, Kiyoshi Ito
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Abstract
The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 Ωm order and having a low core loss in a high frequency region exceeding 1 MHz. The basic component composition of the Mn—Zn ferrite includes 44.0 to 49.8 mol % Fe2O3, 6.0 to 15.0 mol % ZnO (15.0 mol % is excluded), 0.1 to 4.0 mol % at least one of TiO2 and SnO2, and remainder MnO, wherein desired results are obtained by limiting Fe2O3 content to less than 50 mol % that is the stoichiometric composition and adding a proper amount of TiO2 or SnO2 and further controlling its average grain size to less than 10 μm.
Claims4
A Mn—Zn ferrite, characterized in that its basic component composition comprises:
- 44.0 to 49.8 mol % Fe2O3;
- 6.0 to 15.0 mol % ZnO (15.0 mol % is excluded);
- 0.1 to 0.4 mol % at least one of TiO2 and SnO2;
- and remainder MnO, and that its average grain size is less than 10 μm.
A Mn—Zn ferrite, characterized in that its basic component composition comprises:
- 44.0 to 49.8 mol % Fe2O3;
- 6.0 to 15.0 mol % ZnO (15.0 mol % is excluded);
- 0.1 to 0.4 mol % at least one of TiO2 and SnO2;
- 0.1 to 6.0 mol % CuO;
- and remainder MnO, and that its average grain size is less than 10 μm.
Dependencies are inferred from the claim text.