| 摘要 |
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.
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