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The Laves phase Mg 2 MnGa 3  was synthesized from the elements by arc-melting and subsequent annealing in a silica ampoule at  T  = 670 K. The structure of Mg 2 MnGa 3  was refined from single-crystal X-ray diffractometer data: URe 2  type,  Cmcm ,  a  = 543.24(1),  b  = 869.59(3),  c  = 858.58(2) pm,  wR 2 = 0.0556, 273  F   2  values and 24 variables. The manganese and gallium atoms form a three-dimensional network of corner- and face-sharing MnGa 3  tetrahedra that derive as a ternary ordering variant from the hexagonal Laves phase MgZn 2 . The structures of the distortion and coloring variants, i.e., MgZn 2 , URe 2 , Mg 2 Cu 3 Si and Mg 2 MnGa 3  are discussed on the basis of a Bärnighausen tree. The electronic structure calculation data indicate that in addition to the metallic type of bonding an additional covalent interaction appears between the Ga–Ga and Mn–Ga atoms.

Mg 2 MnGa 3 – An orthorhombically distorted superstructure variant of the hexagonal Laves phase MgZn 2