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The ordered Laves phases  RE  2 Rh 3 Ga ( RE =Y, La–Nd, Sm, Gd–Er) were synthesized by arc-melting of the elements and subsequent annealing. The samples were characterized by powder X-ray diffraction (XRD). They crystallize with the rhombohedral Mg 2 Ni 3 Si type structure, space group  R 3̅ m . Three structures were refined from single crystal X-ray diffractometer data:  a =557.1(1),  c =1183.1(2), wR2=0.0591, 159  F  2  values, 10 variables for Y 2 Rh 3 Ga,  a =562.5(2),  c =1194.4(2) pm,  wR 2=0.0519, 206  F  2  values, 11 variables for Ce 2 Rh 3 Ga and  a =556.7(2),  c =1184.1(3) pm,  wR 2=0.0396, 176  F  2  values, 11 variables for Tb 2 Rh 3 Ga. The Rh 3 Ga tetrahedra are condensed via common corners and the large cavities left by the network are filled by the rare earth atoms. The  RE  2 Rh 3 Ga Laves phases crystallize with a  translationengleiche  subgroup of the cubic  RE Rh 2  Laves phases with MgCu 2  type. Magnetic susceptibility measurements reveal Pauli paramagnetism for Y 2 Rh 3 Ga and La 2 Rh 3 Ga. Ce 2 Rh 3 Ga shows intermediate cerium valence while all other  RE  2 Rh 3 Ga phases are Curie–Weiss paramagnets which order magnetically at low temperatures. The  89 Y and  71 Ga solid state nuclear magnetic resonance (NMR) spectra of the diamagnetic representative Y 2 Rh 3 Ga show well-defined single resonances in agreement with an ordered bulk phase. In comparison to the binary Laves phase YRh 2  a strongly increased  89 Y resonance frequency is observed owing to a higher  s -electron spin density at the  89 Y nuclei as proven by density of states (DOS) calculations.

Ternary rhombohedral Laves phases RE 2 Rh 3 Ga ( RE = Y, La–Nd, Sm, Gd–Er)