Patent ID: 7048808

Claim:
A rare-earth sintered magnet of a composition of (R1 x +R2 y )T 100-x-y-z Q z , where R1 is at least one element selected from the group consisting of all rare-earth elements excluding La, Y and Sc, R2 is Y and may optionally include La and/or Sc, T is at least one element selected from the group consisting of all transition elements, and Q is B and may optionally include C, and comprising a crystal grain of an Nd 2 Fe 14 B type compound as a main phase, wherein: molar fractions x, y and z satisfy 8≦x≦18 at %, 0.1≦y≦3.5 at % and 3≦z≦20 at %, respectively; and a concentration of R2 is higher in at least a part of a grain boundary phase than in the crystal grain, and wherein an amount of oxygen is in a range of 2000 ppm to 8000 ppm by weight.