| 简介 |
To provide an R-Fe-B-based rare earth magnet excellent in the squareness and magnetic properties at high temperatures, particularly, the residual magnetization at high temperatures, and method for producing thereof.The present disclosure relates to a rare earth magnet including a main phase 10 and a grain boundary phase 20 present around the main phase 10, and a method for producing thereof. In the rare earth magnet of the present disclosure, the overall composition is represented, in terms of molar ratio, by the formula : (R1(1-x)Lax)y(Fe(1-z)Coz)(100-y-w-v)BwM1v or (R1(1-x)Lax)y(Fe(1-z)Coz)(100-y-w-v)BwM1v·(R2(1-s)M2s)t, wherein R1 is a predetermined rare earth element, M1 is a predetermined element, 0≤x≤0.1, 12.0≤y≤20.0, 0.1≤z≤0.3, 5.0≤w≤20.0, 0≤v≤2.0, 0.05≤s≤0.40, and0.1≤t≤10.0, The main phase 10 has an R2Fe14B-type crystal structure, the average particle diameter of the main phase 10 is less than 1 µm, and the volume ratio of a phase having an RFe2-type crystal structure in the grain boundary phase 20 is 0.40 or less relative to the grain boundary phase 20. |
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