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Six new rare earth metal-rich intermetallic compounds  RE  9 CoMg 4  with  RE =Y, Dy, Ho, Er, Tm and Lu were synthesized by induction-melting the elements in sealed niobium ampoules followed by annealing in muffle furnaces. The structures of Y 9 CoMg 4  and Tm 8.56 CoMg 4.44  were refined from single-crystal X-ray diffraction data:  P 6 3 / mmc ,  a =965.65(6),  c =971.07(5) pm,  wR 2=0.0599, 614  F  2  values, 20 variables for Y 9 CoMg 4  and  a =945.20(4),  c =953.11(5) pm,  wR 2=0.0358, 585  F  2  values, 21 variables for Tm 8.56 CoMg 4.44  (a small homogeneity range results from Tm/Mg mixing). The  RE  9 CoMg 4  phases crystallize with a coloring variant of the aristotype Co 2 Al 5 . The striking structural motif is a hexagonal rod packing of rows of corner- and face-sharing tetrahedral Mg 4  clusters with Mg–Mg distances ranging from 304 to 317 pm in Y 9 CoMg 4 . These rows are similar to the hexagonal Laves phases  RE Mg 2 . The space between the rows is filled with rows of face-sharing Co@Y 6  trigonal prisms (TP) and empty Y 6  octahedra (O) in the sequence –TP–O–O–. The many isopointal coloring variants of the aristotype Co 2 Al 5  are briefly discussed.

zeitschrift für kristallographie - crystalline materials 

Rows of corner- and face-sharing Mg 4  tetrahedra arranged as hexagonal rod packing in the hexagonal Laves phases  RE Mg 2  and the rare earth-rich phases  RE  9 CoMg 4  ( RE =Y, Dy-Tm, Lu)