Abstract
AbstractLarger single crystals of Yb4Rh7Ge6 and Yb4Ir7Ge6 were prepared from arc‐melted precursor alloys Rh7Ge6 and Ir7Ge6 and elemental ytterbium via the Bridgman method using tungsten crucibles. Yb4Rh7Ge6 and Yb4Ir7Ge6 were investigated by X‐ray diffraction on powders and single crystals. Both germanides crystallize with the cubic U4Re7Si6 type structure, space group Im3m. Structure refinement from X‐ray single crystal diffractometer data yielded a = 825.3(1) pm, wR2 = 0.0292, 106 F2 values, 10 variable parameters for Yb4Rh7Ge6 and a = 826.6(2) pm, wR2 = 0.0486, 150 F2 values, 10 variable parameters for Yb4Ir7Ge6. The structures contain two crystallographically independent transition metal (T) atoms with octahedral (T1) and tetrahedral (T2) germanium coordination. The octahedra and tetrahedra are condensed via common corners and edges forming complex three‐dimensional [T7Ge6] networks in which the trivalent ytterbium atoms fill voids of coordination number 14.
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