Fe—Si—La alloy having excellent magneto-caloric properties

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The invention relates to a Fe—Si—La alloy having the atomic composition : [in-line-formulae](La1-a-a′MmaTRa′)1[(Fe1-b-b′CObMb′)1-x(Si1-cXc)x]13(CdNeH1-d-e)y(R)z(I)f [/in-line-formulae]Mm representing 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, the said mixture possibly comprising up to 1% by weight of impurities, TR representing one or more elements of the rare earth family other than lanthanum, M representing one or more type d transition elements of the 3d, 4d and 5d layersX representing a metalloid element selected from Ge, Al, B, Ga and InR representing one or more elements selected from Al, Ca, Mg, K and Na, I representing one or two elements selected from O and S, with : [in-line-formulae]0≦a<0.5 and 0≦a′<0.2[/in-line-formulae][in-line-formulae]0≦b≦0.2 and 0≦b′<0.4[/in-line-formulae][in-line-formulae]0≦c≦0.5 and 0≦d≦1[/in-line-formulae][in-line-formulae]0≦e≦1 and f≦0.1[/in-line-formulae][in-line-formulae]0.09≦x≦0.13 and 0.002≦y≦4[/in-line-formulae][in-line-formulae]0.0001≦z≦0.01[/in-line-formulae]the subscripts b, d, e, x and y being such that the alloy further satisfies the following condition : [in-line-formulae]6.143b(13(1−x))+4.437y[1−0.0614(d+e)]≧1  Eq.1[/in-line-formulae][in-line-formulae]d*y≧0.005  Eq.2[/in-line-formulae] It also relates to a powder of this alloy or to a mixture of these alloys and the method of fabrication.