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Synthesis and Structures of Yb 4 Rh 7 Ge 6 and Yb 4 Ir 7 Ge 6
Author(s) -
Heying Birgit,
Katoh Kenichi,
Niide Yuzuru,
Ochiai Akira,
Pöttgen Rainer
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400134
Subject(s) - crystallography , ytterbium , octahedron , diffractometer , tetrahedron , materials science , germanium , crystal structure , single crystal , diffraction , transition metal , tungsten , chemistry , doping , metallurgy , physics , catalysis , optics , silicon , biochemistry , optoelectronics
Larger single crystals of Yb 4 Rh 7 Ge 6 and Yb 4 Ir 7 Ge 6 were prepared from arc‐melted precursor alloys Rh 7 Ge 6 and Ir 7 Ge 6 and elemental ytterbium via the Bridgman method using tungsten crucibles. Yb 4 Rh 7 Ge 6 and Yb 4 Ir 7 Ge 6 were investigated by X‐ray diffraction on powders and single crystals. Both germanides crystallize with the cubic U 4 Re 7 Si 6 type structure, space group Im 3 m . Structure refinement from X‐ray single crystal diffractometer data yielded a = 825.3(1) pm, wR2 = 0.0292, 106 F 2 values, 10 variable parameters for Yb 4 Rh 7 Ge 6 and a = 826.6(2) pm, wR2 = 0.0486, 150 F 2 values, 10 variable parameters for Yb 4 Ir 7 Ge 6 . The structures contain two crystallographically independent transition metal ( T ) atoms with octahedral ( T 1) and tetrahedral ( T 2) germanium coordination. The octahedra and tetrahedra are condensed via common corners and edges forming complex three‐dimensional [ T 7 Ge 6 ] networks in which the trivalent ytterbium atoms fill voids of coordination number 14.