| 摘要 |
<p>A rare earth sintered magnet includes a main phase that includes an R 2 T 14 B phase of crystal grain where R is one or more rare earth elements including Nd, T is one or more transition metal elements including Fe or Fe and Co, and B is B or B and C; a grain boundary phase in which a content of R is larger than a content of the R 2 T 14 B phase; and a grain boundary triple point that is surrounded by three or more main phases. The grain boundary triple point includes an R75 phase containing R of 60 at% to 90 at%, Co, and Cu. The relational expression 0.05 ‰¤ (Co + Cu)/R < 0.5 is satisfied. An area where a Co-rich region overlaps with a Cu-rich region in a cross-sectional area of the grain boundary triple point is 60% or more.</p> |
