MAGNETIC-PROPERTIES OF YCO10MO2-XMX COMPOUNDS (M = SI OR V)

YCo10Mo2-xMx compounds (M=Si or V and x=0, 0.5, 1.0, 1.5, 2.0) with th e ThMn12 structure have been prepared by means of are-melting and subs equent annealing. The magnetic properties have been investigated by X- ray diffraction on magnetically aligned powders, by a.c. susceptibilit y and by magnetization measurements. The lattice constants of the YCo1 0Mo2-xMx compounds decrease linearly with increasing x, according to V egard's law. The magnetic properties of both series are different. Dev iations of the spontaneous moment and the Curie temperature from a lin ear x dependence are observed, occurring in opposite directions in the two series investigated. This behaviour is discussed in terms of pref erred Go-site occupation in the materials. (C) 1998 Elsevier Science S .A.