MAGNETIC-PROPERTIES OF RARE-EARTH COMPOUNDS OF THE TYPE R(FE,NI)(10)SI-2

The magnetic properties of rare-earth compounds of the type HoFe10-xNi xSi2 were investigated by means of X-ray diffraction and measurements of the magnetisation and the AC-susceptibility. It is shown that these compounds form a complete series of solid solution in which the tetra gonal ThMn12-type of structure is retained for all concentrations. Fro m magnetic measurements made on HoNi10Si2 and GdNi10Si2, it is shown t hat the presence of Fe moments is essential for the occurrence of magn etic ordering above 4.2 K. For sufficiently high Fe concentration a ma gnetic moment is induced on the Ni atoms.