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Yb 6 Ir 5 Ga 7 – A MgZn 2 Superstructure
Author(s) -
Seidel Stefan,
Pöttgen Rainer
Publication year - 2017
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.201600422
Subject(s) - superstructure , substructure , diffractometer , crystallography , materials science , crystal structure , iridium , gallium , niobium , laves phase , chemistry , intermetallic , metallurgy , physics , thermodynamics , biochemistry , structural engineering , alloy , engineering , catalysis
The gallide Yb 6 Ir 5 Ga 7 was synthesized by high‐frequency melting of the elements in a sealed niobium ampoule. The structure was refined from single‐crystal X‐ray diffractometer data: Nb 6.4 Ir 4 Al 7.6 type, P 6 3 / mcm, a = 930.4(1), c = 843.0(1) pm, wR 2 = 0.0597, 379 F 2 values and 22 variables. Yb 6 Ir 5 Ga 7 adopts a superstructure of the MgZn 2 Laves phase by a complete ordering of the iridium and gallium atoms on the zinc substructure, i.e. the network consists of ordered and condensed Ir 3 Ga and IrGa 3 tetrahedra with Ir–Ga distances ranging from 260 to 265 pm. The crystal chemical details and the underlying group‐subgroup scheme are discussed.