Ferrite material
AssigneeHitachi Metals, Ltd.
InventorsYasuharu Miyoshi, Tomoyuki Tada
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Abstract
A ferrite material in which Bi2O3 is added at 6% by weight or less, and preferably 4% by weight or less, to a ferrite of Li—Zn—(Mn, Fe) containing a specified amount of Mn. In the ferrite material, change of magnetic permeability under high external stress is extremely small, and a core loss under a compression stress is small. By using this ferrite material, an inductor and transformer having small loss even in a state of being molded with resin can be obtained.
Claims9
A ferrite material having a composition formula of x(Li0.5Fe0.5)O.yZnO.z(Mn, Fe)2O3, and wherein in a case of a=Mn/(Mn+Fe), Bi2O3 is added from 0.2% by weight to 6% by weight, to a material in which x, y, z, and a in the composition formula and in the condition satisfy the following relations:
- 0.18≦x≦0.30, 0.20≦y≦0.30, 0.48≦z≦0.53, 0.01≦a≦0.25, and x+y+z=1.
Dependencies are inferred from the claim text.