Magnetic characteristics of four ternary Laves phase and four ternary Haucke phase systems represented by the formulas Ln x Ln 1− x Ni 2 and Ln x Ln′ 1− x Ln 5, respectively, are reported. LnLn′ combinations studied are: GdDy, GdHo, GdNd and HoNd, comprising two heavy-heavy and two heavy-light combinations. Saturation moments and Weiss constants (θ) indicate that the LnLn′ spins always couple ferromagnetically, as in the Ln x Ln′ 1− x Al 2 systems, for all cases except in the Ho x Nd 1− x Ni 5 system. The measured saturation moments are inconclusive for this system. However, from the temperature dependence of magnetization this system appears to be antiferromagnetic as expected from the systematics of the spin coupling observed for related ternaries. Curie-Weiss (C-W) behavior with paramagnetic moments in good agreement with free-ion values is exhibited by all systems except Gd x Nd 1− x Ni 5. Large departures from C-W behavior and large negative Weiss constants are noted for this system. These are ascribed to interactions with the crystal field. The crystal field interaction is more important in Gd x Nd 1− x Ni 5 than in Ho x Nd 1− x Ni 5 implying significantly different conduction electron behavior in these materials. The magnetic behavior of the Haucke phases is less ideal than the Laves phases, presumably due to the higher Ni concentration in the former and the greater likelihood that Ni is involved in the magnetic interactions.