R-FE-B-BASED SINTERED MAGNET CONTAINING NO HEAVY RARE EARTH ELEMENTS, AND PREPARATION METHOD THEREF

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The present invention relates to a R-Fe-B-based sintered magnet, wherein the sintered magnet comprises : a main phase formed by R2Fe14B (R is La, Ce, Nd, Pr, Pm, Sm, Eu or Nb) grains containing a light rare earth element; and a second phase composed of a microstructure in which a R-rich phase (R is La, Ce, Nd, Pr, Pm, Sm, Eu or Nb) containing a light rare earth element encompasses the grains and a grain boundary formed by the R2Fe14B grains selectively contains a high-melting-point metal element, and the contiguity between adjacent two R2Fe14B grains is 50% or less.