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The quasi-binary system YbMg 2 -YbIn 2  was studied around the equiatomic composition. In contrast to the ordered rare earth ( RE ) phases  RE MgIn (ZrNiAl type), ytterbium forms phases with different structures and pronounced Mg/In mixing ( M  sites). The structures of YbMg 0.75 In 1.25  (CaLiSn type,  P 3 m 1,  a  = 501.95(7),  c  = 1087.3(2) pm,  wR 2 = 0.0490, 790  F   2  values, 32 variables) and Yb 6 Mg 6.41 In 5.59  (Yb 6 Ir 5 Ga 7  type,  P 6 3 / mcm ,  a  = 1060.77(14),  c  = 970.27(16) pm,  wR 2 = 0.0484, 701  F   2  values, 26 variables) were refined from single-crystal X-ray diffractometer data. YbMg 0.75 In 1.25  is an AlB 2  superstructure with a tripling of the subcell. The magnesium and indium atoms form three differently puckered layers of  M   6  hexagons. The Yb 6 Mg 6.41 In 5.59  structure is derived from the hexagonal Laves phase YbMg 2  (MgZn 2  type,  P 6 3 / mmc ). A  klassengleiche  symmetry reduction leads to four crystallographically independent  M  sites for the rows of corner- and face-sharing tetrahedra which allow a composition close to the equiatomic one. The  M – M  distances in both structures cover the broad range from 289 to 331 pm, comparable to the sums of the covalent radii. Temperature dependent magnetic susceptibility studies of the polycrystalline YbMg 0.75 In 1.25  and Yb 12 Mg 13 In 11  samples indicate Pauli paramagnetism with room temperature values of 2.8(1) × 10 −3  emu mol −1  (YbMg 0.75 In 1.25 ) and 5.2(1) × 10 −3  emu mol −1  (Yb 12 Mg 13 In 11 ).

The crystal structures and magnetic properties of YbMg 0.75 In 1.25 and Yb 6 Mg 6.41 In 5.59