Abstract
AbstractNew ternary indides RE10Rh9±xIn20 (RE = Y, Tb‐Tm, Lu) were synthesized from the elements by arc‐melting under argon and subsequent annealing in alumina or tantalum crucibles. YbRhIn2 was prepared in a sealed tantalum ampoule in an induction furnace. X‐ray powder and single crystal data for RE10Rh9+xIn20 revealed isotypy with the tetragonal Ho10Ni9In20 type structure, space group P4/nmm. A crystal of Tm10Rh9In20 shows the ideal composition: a = 1335.42(7), c = 921.26(6) pm, wR2 = 0.0524, 1460 F2 values and 62 variable parameters, while the RE10Rh9In20 indides with the lighter rare earth metals contain an additional rhodium site leading to a homogeneity range according to RE10Rh9±xIn20. This was manifested from X‐ray single crystal data for Y10Rh9.19(1)In20, Tb10Rh9.40(1)In20, Dy10Rh9.07(1)In20, Dy10Rh9.52(1)In20, Ho10Rh9.41(1)In20, and Er10Rh9.27(1)In20. On the other hand, defects were found for the Rh2 site of Lu10Rh8.87(1)In20. The crystal chemistry of the RE10Rh9In20 indides and the structurally related REPdIn2 indides with tetragonal HfNiGa2 structure is discussed. YbRhIn2 was synthesized in a sealed tantalum ampoule. It adopts the orthorhombic MgCuAl2 type structure: Cmcm, a = 418.24(6), b = 1024.0(2), c = 807.5(1) pm, wR2 = 0.0477, 292 F2 values and 16 variable parameters. The rhodium atoms fill distorted triangles of an orthorhombically distorted YbIn2 substructure.
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