MAGNETIC-PROPERTIES OF Y(2)FE(17-X)M(X)C(Y) COMPOUNDS (M=GA,AL AND SI)

The structural and magnetic properties of are-melted Y(2)Fe(17-x)M(x)C (y) (M = Ga, Al and Si; x = 0-4, y = 0-3) compounds have been investig ated For M = Ga, the Th2Zn17-type structure was maintained in the allo ys up to x = 4, y = 2, but only up to x = 4, y = 1 and x = 2, y = 1 fo r M = Al and Si, respectively. For the Y(2)Fe(,17-x)M(x) compounds, th e substitution of certain amounts of Ga, Al and Si increases the Curie temperature (T-C) and the saturation magnetization (M(s)). For the Y( 2)Fe(17-x)M(x)C(y) compounds, the value of M(x) decreases monotonicall y with x, although the effect of x on T-C is different, depending on t he sites the elements (M = Ga, Al and Si) occupy. The contribution of the Fe-Fe sublattice exchange interaction and magnetic dilution due to the nonmagnetic element substitution determine the T-C and M(s) of th ese alloys.