Abstract
The lattice constants, Curie temperature and magnetization of the pseudo-binary system Gd(Co 1− x Ni x ) 5 were determined as functions of composition. The microstructure of the as-cast samples is duplex for x ⩽ 0.5; the annealed samples are single phase with a CaCu 5-type hexagonal structure. The composition dependence of the lattice constants of Gd(Co 1− x Ni x ) 5 compounds does not obey Vegard's law. Compensation points were observed in the magnetization versus temperature curves for compounds with x ⩽ 0.6; however, they vanish at x = 0.8. These findings are elucidated in the light of the currently accepted ferrimagnetic coupling scheme.
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