Patent ID: 8808468

Claim:
An Fe—Si—La alloy comprising: (La 1-a-a′ M m a TR a′ ) 1 [(Fe 1-b-b′ CO b M b′ ) 1-x (Si 1-c X c ) x ] 13 (C d N e H 1-d-e ) y (R) z (I) f , wherein Mm represents a mixture of lanthanum, cerium, neodymium and praseodynium in the weight proportion of 22 to 26% La, 48 to 53% Ce, 17 to 20% Nd, and 5 to 7% Pr, said mixture comprising up to 1% by weight of impurities; TR represents at least one rare earth family element other than lanthanum; M represents at least one type d transition element of the 3d, 4d, or 5d layers; X represents a metalloid element selected from the group consisting of Ge, Al, B, Ga, and In; R represents at least one element selected from the group consisting of Ca, Mg, K, and Na; and I represents one or two elements selected from the group consisting of O and S; 0≦ a< 0.5 and 0≦ a′< 0.2; 0≦ b≦ 0.2 and 0≦ b′< 0.4; 0≦ c≦ 0.5 and 0≦ d≦ 1; 0≦ e≦ 1 and f≦ 0.1; 0.09≦ x≦ 0.13 and 0.002≦ y≦ 4; 0.0001≦ z≦ 0.01; and subscripts b, d, e, x and y are such that: 6.143 b (13(1− x ))+4.437 y[ 1−0.0614( d+e )]≧1, and d×y≧ 0.005.