Abstract

The magnetic properties of rare-earth compounds of the type HoFe 10− x Ni x Si 2 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 tetragonal ThMn 12-type of structures is retained for all concentrations. From magnetic measurements made on HoNi 10Si 2 and GdNi 10Si 2, it is shown that the presence of Fe moments is essential for the occurrence of magnetic ordering above 4.2 K. For sufficiently high Fe concentration a magnetic moment is induced on the Ni atoms.

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