FE-SI-LA ALLOY HAVING EXCELLENT MAGNETO-CALORIC PROPERTIES

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The invention relates to a Fe—Si—La alloy having the following atomic composition : (La1-a-a′MmaTRa′)1[(Fe1-b-b, CobMb, )1-x(Si1-cXc)x]13(CdNeH1-d-e)y(R)r(I)r, in which Mm is a mixture of lanthanum, cerium, neodymium and praseodymium in a weight proportion of 22 to 26% of La, 48 to 53% of Ce, 17 to 20% of Nd and 5 to 7% of Pr, wherein said mixture may include up to 1 wt % of impurities, TR is one or more elements of the rare earth family other than lanthanum, M is one or more d-type transition element from layers 3d, 4d and 5d, X is a metalloid element selected from Ge, Al, B, Ga and In, R is one or more element selected from Al, Ca, Mg, K and Na, I is one or two elements selected from O and S, with : 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; the indicia b, d, e, x and y being such that the alloy further meets the following condition : 6.143b(13(1−x))+4.437y[1−0.0614(d++e)]≧1 Eq.1 d*y≧0.005 Eq.2. The invention also relates to a powder of this alloy or mixture of these alloys, and to a method for producing the same.