Patent ID: 7867343

Claim:
An R-T-B rare earth permanent sintered magnet containing an R 2 T 14 B phase (R is a rare earth element, T is a transition metal element, and B is boron) as a main phase and an R-rich phase that is positioned in a grain boundary of the R 2 T 14 B phase, a concentration of the rare earth element R in the R-rich phase is higher than that in the R 2 T 14 B phase, wherein the rare earth element R contains at least one kind of element R L selected from the group consisting of Nd and Pr, and at least one kind of element R H selected from the group consisting of Dy, Tb, and Ho, and the element R H accounts for 10 at % or more of the total of the contained rare earth element, and a mole fraction of the element R H included in the R 2 T 14 B phase is larger than a mole fraction of the element R H in the total of the contained rare earth element, wherein the rare earth element R is 11 at % or more and 17 at % or less of the total, the transition metal element T is 75 at % or more and 84 at % or less of the total, and the element B is 5 at % or more and 8 at % or less of the total.