Yb₆Ir₅Ga₇ - A MgZn₂ Superstructure

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• 作者：Stefan Seidel and Rainer P&ouml ; ttgen
• 刊名：Zeitschrift für anorganische und allgemeine Chemie
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：643
• 期：3
• 页码：261-265
• 全文大小：895K
• ISSN：1521-3749

文摘

The gallide Yb₆Ir₅Ga₇ 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_6.4Ir₄Al_7.6 type, P6₃/mcm, a = 930.4(1), c = 843.0(1) pm, wR₂ = 0.0597, 379 F² values and 22 variables. Yb₆Ir₅Ga₇ adopts a superstructure of the MgZn₂ 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 Ir₃Ga and IrGa₃ tetrahedra with Ir–Ga distances ranging from 260 to 265 pm. The crystal chemical details and the underlying group-subgroup scheme are discussed.