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SrAu4Ga3: a further example with Ga3 units and a Lonsdaleite-related gold substructure

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Abstract

The gallide SrAu4Ga3 was obtained by induction melting of the elements in a sealed tantalum tube and subsequent annealing in a muffle furnace. SrAu4Ga3 is isotypic with Ba3Ag14.6Al6.4. Its structure was refined from single crystal X-ray diffractometer data: \({P}{\bar{6}}\)2m, a = 860.9(3) pm, c = 720.4(2) pm, wR = 0.0342, 678 F values, and 30 variables. The gold atoms build a distorted lonsdaleite-related (hexagonal diamond) substructure and the cavities left by this network are filled in an ordered manner by the strontium atoms as well as Ga3 and (Ga,Au)3 triangles. The latter have Ga–Ga and Ga/Au–Ga/Au distances of 305 and 262 pm, respectively. Consequently one can topologically describe the SrAu4Ga3 structure as an ordered substitution variant of the Zintl phase CaIn2. This structural relationship is discussed on the basis of a group–subgroup scheme.

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Acknowledgments

We thank Dipl.-Ing. U. Ch. Rodewald for the intensity data collection and N. Roustide for experimental help. This work was financially supported by the Deutsche Forschungsgemeinschaft.

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  1. Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149, Münster, Germany

    Stefan Seidel, Rolf-Dieter Hoffmann & Rainer Pöttgen

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  1. Stefan Seidel
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  2. Rolf-Dieter Hoffmann
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  3. Rainer Pöttgen
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Correspondence to Rainer Pöttgen.

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Seidel, S., Hoffmann, RD. & Pöttgen, R. SrAu4Ga3: a further example with Ga3 units and a Lonsdaleite-related gold substructure. Monatsh Chem 145, 1043–1049 (2014). https://doi.org/10.1007/s00706-014-1205-x

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