R-FE-B系烧结磁铁

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An R-Fe-B base sintered magnet having a composition of 12-17 at% of R (in which R stands for at least two of yttrium and rare earth elements and essentially contains Nd and Pr), 0.1-3 at% of Si, 5-5.9 at% of B, 0-10 at% of Co, and the balance of Fe, containing a R2(Fe, (Co), Si)14B intermetallic compound primary phase and at least 1% by volume of an R-Fe(Co)-Si grain boundary phase, and being free of a B-rich phase exhibits a coercive force of at least 10 kOe despite a reduced content of heavy rare earth.