Ferrite sintered magnet and method for manufacturing ferrite sintered magnet
AssigneeTDK Corporation
InventorKeisuke Kamiya
Life of this patent
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Abstract
A ferrite magnet includes: a hexagonal ferrite main phase; and a second phase. The second phase is an oxide phase containing: an element A which is at least one selected from the group consisting of Ca, Sr, Ba, Bi, and rare earth elements; a transition metal element T including at least Fe; and an element G which is at least one selected from the group consisting of Si, Al, B, F, K, Na, Li, P, and S. When the total number of atoms of the element A, the transition metal element T, and the element G in the second phase is set to 100 at %, the element A occupies 30 to 80 at %, the element G occupies 15 to 40 at %, and the transition metal element T occupies less than 4 at %.
Claims4
A ferrite sintered magnet comprising:
- a hexagonal ferrite main phase;
- and
- a second phase,
- wherein the second phase is an oxide phase containing
- an element A which is at least one selected from the group consisting of Ca, Sr, Ba, Bi, and rare earth elements,
- a transition metal element T including at least Fe, and
- an element G which is at least one selected from the group consisting of Si, Al, B, F, K, Na, Li, P, and S, and
- wherein, when the total number of atoms of the element A, the transition metal element T, and the element G in the second phase is set to 100 at %,
- the element A accounts for 30 to 80 at %,
- the element G accounts for 15 to 40 at %,
- the transition metal element T accounts for less than 4 at %,
- La accounts for 10 to 65 at %, and
- the atomic proportion of Fe in the second phase is less than or equal to 3 at %.
Dependencies are inferred from the claim text.