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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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1865-7117
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Volume 62, Issue 10

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Sr14[Al4]2[Ge]3: Eine Zintl-Phase mit isolierten [Ge]4–- und [Al4]8–-Anionen / Sr14[Al4]2[Ge]3: A Zintl Phase with Isolated [Ge]4− and [Al4]8− Anions

Marco Wendorff
  • Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
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/ Caroline Röhr
  • Corresponding author
  • Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-2007-1001

The new ternary intermetallic compound Sr14[Al4]2[Ge]3 was synthesized from stoichiometric ratios of the elements. The crystal structure (trigonal, space group R3̅, a = 1196.58(2), c = 4010.33(7) pm, Z = 6, R1 = 0.0574) was determined using single crystal X-ray data. The structure contains two crystallographically independent tetrahedral [Al4] anions with Al-Al distances in the range from 269.7 to 273.6 pm. Taking into account the Zintl concept and the isosteric analogy to white phosphorus, their formal charge is−8. Both of these tetrahedra are surrounded by 16 Sr cations. The three isolated Ge4− anions per formula unit (isosteric to the noble gases) are coordinated by nine Sr cations. According to the ionic description Sr14[Al4]2[Ge]3̅↦14Sr2+ +2[Al4]8− +3[Ge]4− the title compound is an electron-precise Zintl phase. This interpretation is supported by the results of a FP-LAPW band structure calculation, which show a distinct minimum of the total density of states at the Fermi level. Attempts to synthesize the analogous compounds in the systems Sr-Ga-Ge and Ca-Ga-Ge resulted in the formation of new members of the Ca11Ga7 structure type family. In the case of Ca-Al-Ge only the stable binary border compounds Ca2Ge and CaAl2 were formed in respective experiments.

Keywords: Aluminium; Germanium; Zintl Phases; Band Structure Calculation

About the article

Received: 2007-06-05

Published Online: 2014-06-02

Published in Print: 2007-10-01


Citation Information: Zeitschrift für Naturforschung B, Volume 62, Issue 10, Pages 1227–1234, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2007-1001.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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