The results of neutron diffraction studies on the preferential occupation of iron and cobalt atoms in
the pseudobinary series Nd2(Fe1-xCox)17 are used to evaluate the differences in the contribution of iron
and cobalt atoms to the magnetic anisotropy of the four inequivalent crystallographic sites. With these four
parameters an almost perfect fit to the experimental anisotropy data for the pseudobinary series Y2(Fe1-xCo
x)17 is achieved. ?? 1986.
