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The isotypic intermetallic compounds RE 2 RuMg 2  (RE = Dy, Ho, Er, Tm, Lu) were synthesized from the elements in sealed niobium tubes in a muffle furnace with different annealing sequences. The polycrystalline samples were characterized through Guinier powder patterns. The structure of Er 2 RuMg 2  was refined on the basis of single-crystal X-ray diffractometer data: ordered Os 2 Al 3  type, I4/mmm, a = 338.44(5), c = 2029.4(4) pm, wR2 = 0.0237, 234F 2  values, and 10 variables. The Er 2 RuMg 2  structure is an i5 superstructure of the bcc packing with complete ordering of the erbium, ruthenium, and magnesium atoms. Layers of compressed, ruthenium-centered erbium cubes (290 pm Er-Ru) alternate with layers of edge-sharing magnesium tetrahedra (311 and 338 pm Mg-Mg); a new type of magnesium substructure. Temperature dependent magnetic susceptibility studies confirm the stable trivalent ground states of the rare earth elements. Lu 2 RuMg 2  is a Pauli paramagnet and the remaining four compounds show Curie paramagnetism. Dy 2 RuMg 2  and Ho 2 RuMg 2  are accompanied by antiferromagnetic ordering at 8.9(1) and 3.6(1) K, respectively.

Synthesis and structure of RE 2 RuMg 2 (RE = Dy, Ho, Er, Tm, Lu) – i5 superstructures of the bcc packing