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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences


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Volume 69, Issue 1

Issues

Sr2Au6Al3 and Eu2Au6Al3 – First Representatives of the Sr2Au6Zn3 Type with Aluminum Triangles

Birgit Gerke
  • Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Rainer Pöttgen
  • Corresponding author
  • Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
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Published Online: 2014-06-02 | DOI: https://doi.org/10.5560/znb.2014-3300

The aluminides Sr2Au6Al3 and Eu2Au6Al3 were synthesized by melting the elements in sealed tantalum tubes in a muffle or induction furnace. The samples were characterized by powder and single-crystal X-ray diffraction: Sr2Au6Zn3 type, R3̄c, a = 845.1(1), c = 2177.2(3) pm, wR2=0.0263, 520 F2 values, 20 variables for Sr2Au6.18(1)Al2.82(1), and a = 838.0(1), c = 2177.1(7) pm, wR2 = 0.0276, 510 F2 values, 19 variables for Eu2Au6Al3. The gold atoms build up diamond-related networks of slightly distorted tetrahedra in the stacking sequence of the 6R polytype (289 - 296 pm Au-Au in Eu2Au6Al3). The voids left by this network are filled in an ordered manner by strontium (europium) atoms and the rare motif of Al3 triangles (286 pm Al-Al in Eu2Au6Al3). The Al3 triangles in Sr2Au6.18(1)Al2.82(1) show a small degree of Al/Au mixing.

Graphical Abstract

Sr2Au6Al3 and Eu2Au6Al3 – First Representatives of the Sr2Au6Zn3 Type with Aluminum Triangles

Sr2Au6Al3 and Eu2Au6Al3 – First Representatives of the Sr2Au6Zn3 Type with Aluminum Triangles

Keywords: Aluminum; Crystal Structure; Stuffed Diamond Network; Gold; Europium; Strontium

About the article

Received: 2013-11-18

Published Online: 2014-06-02

Published in Print: 2014-01-01


Citation Information: Zeitschrift für Naturforschung B, Volume 69, Issue 1, Pages 121–124, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.5560/znb.2014-3300.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung.

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