Comment on the crystal and magnetic structures of CaCu5-type compounds of th with Fe, Co, and Ni

The results of neutron and X-ray diffraction studies on compounds of the series ThFe5−5xNi5x are re-interpreted using the experimental data now available for similar compounds of the series ThCo5−5xNi5x and ThFe5−5xCo5x. It is shown that in ThFe5−5xNi5x, too, there also exists a deviation from the truly random distribution of the 3d atoms over the two available crystallographic sites. For all series mentioned the preferential occupancy of the 2(c) site is consistently given as Ni > Co > Fe.