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The gallium-containing Heusler phases ScRh 2 Ga, ScPd 2 Ga, TmRh 2 Ga and LuRh 2 Ga have been synthesized by arc-melting of the elements followed by different annealing sequences to improve phase purity. The samples have been studied by powder X-ray diffraction. The structures of Lu 0.97 Rh 2 Ga 1.03  ( Fm 3̅ m ,  a =632.94(5) pm,  wR 2=0.0590, 46 F 2  values, seven variables) and Sc 0.88 Rh 2 Ga 1.12  ( a =618.91(4) pm,  wR 2=0.0284, 44 F 2  values, six variables) have been refined from single crystal X-ray diffractometer data. Both gallides show structural disorder through Lu/Ga and Sc/Ga mixing. Temperature dependent magnetic susceptibility measurements showed Pauli paramagnetism for ScRh 2 Ga, ScPd 2 Ga, and LuRh 2 Ga and Curie-Weiss paramagnetism for TmRh 2 Ga.  45 Sc and  71 Ga solid state MAS NMR spectroscopic investigations of the Sc containing compounds confirmed the site mixing effects typically observed for Heusler phases. The data indicate that the effect of mixed Sc/Ga occupancy is significantly stronger in ScRh 2 Ga than in ScPd 2 Ga.

Gallium-containing Heusler phases ScRh 2 Ga, ScPd 2 Ga, TmRh 2 Ga and LuRh 2 Ga – magnetic and solid state NMR-spectroscopic characterization