Patent ID: 9087631
Filing Date: 2015-07-21
Classification: C22C,C22F,H01F,H02K

Abstract:
1. A permanent magnet, comprising: a composition represented by a composition formula: where, R is at least one element selected from rare earth elements, M is at least one element selected from Zr and Hf, A is at least one element selected from Ni, V, Cr, Mn, Al, Ga, Nb, Ta and W, p is a number (atomic ratio) satisfying 0.3≦p≦0.6, q is a number (atomic ratio) satisfying 0.01≦q≦0.1, r is a number (atomic ratio) satisfying 0.01≦r≦0.15, s is a number (atomic ratio) satisfying 0.2≦s≦0.5, t is a number (atomic ratio) satisfying 0≦t≦0.2, z is a number (atomic ratio) satisfying 6≦z≦9; and a structure composed mainly of a Th wherein a ratio (c/a) of a lattice constant c in relation to a lattice constant a in a crystal structure of the permanent magnet is equal to or more than 0.839, where a crystal face perpendicular to a direction of an easy magnetization axis is a face a, one of crystal faces parallel to the direction of the easy magnetization axis is a face b, an x-ray main diffraction angle of the face a is 2θ