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The magnesium-rich intermetallic compound Sm 3 RuMg 7  was synthesized by induction melting of the elements. Single crystals were grown by slow cooling of the polycrystalline sample. The structure was characterized by powder and single-crystal X-ray diffraction: ordered Ti 6 Sn 5  type, P6 3 /mmc, Z = 2, a = 1034.1(2), c = 611.3(1) pm, wR2 = 0.0216, 399 F 2  values and 19 parameters. The ruthenium atoms have slightly distorted octahedral samarium coordination. These RuSm 6/2  octahedra (Ru-Sm 279 pm) are condensed via common faces leading to chains in the c direction which are arranged in the form of a hexagonal rod packing. Between these rods the Mg2 atoms build chains of face-sharing trigonal prisms. Alternately these prisms are centered by Mg3 or capped by Mg1 atoms on the rectangular faces. Within the magnesium substructure the Mg-Mg distances range from 303 to 335 pm. The Mg3 site shows slight mixing with samarium, leading to the composition Sm 3.16 RuMg 6.84  for the investigated crystal. The compounds RE 3 RuMg 7  (RE = Gd, Tb) are isotypic.

Chains of Condensed RuSm 6/2 Octahedra in Sm 3 RuMg 7 – A Ternary Ordered Version of the Ti 6 Sn 5 Type