主权项 |
1. A rare earth based magnet, comprising,
R2T14B main phase crystal grains and crystal boundary phases, with at least a first crystal boundary phase and a second crystal boundary phase being contained, wherein, the first crystal boundary phase contains at least R-T-M in the following ranges, R: 20 to 40 atomic %, T: 60 to 75 atomic %, M: 1 to 10 atomic %; and, the second crystal boundary phase contains at least R-T-M in the following ranges, R: 50 to 70 atomic %, T: 10 to 30 atomic % M: 1 to 20 atomic %; wherein, R represents the rare earth element, T represents at least one iron family element with Fe as essential, and M represents at least one element selected from the group consisting of Al, Ge, Si, Sn and Ga. |