Mg2MnGa3 – An orthorhombically distorted superstructure variant of the hexagonal Laves phase MgZn2

Nazar Pavlyuk; Ihor Chumak; Volodymyr Pavlyuk; Helmut Ehrenberg; Sylvio Indris; Viktor Hlukhyy; Rainer Pöttgen

doi:10.1515/znb-2022-0109

Article

Mg₂MnGa₃ – An orthorhombically distorted superstructure variant of the hexagonal Laves phase MgZn₂

Nazar Pavlyuk , Ihor Chumak , Volodymyr Pavlyuk , Helmut Ehrenberg , Sylvio Indris , Viktor Hlukhyy and Rainer Pöttgen

Published/Copyright: August 29, 2022

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From the journal Zeitschrift für Naturforschung B Volume 77 Issue 10

Abstract

The Laves phase Mg₂MnGa₃ was synthesized from the elements by arc-melting and subsequent annealing in a silica ampoule at T = 670 K. The structure of Mg₂MnGa₃ was refined from single-crystal X-ray diffractometer data: URe₂ type, Cmcm, a = 543.24(1), b = 869.59(3), c = 858.58(2) pm, wR2 = 0.0556, 273 F ² values and 24 variables. The manganese and gallium atoms form a three-dimensional network of corner- and face-sharing MnGa₃ tetrahedra that derive as a ternary ordering variant from the hexagonal Laves phase MgZn₂. The structures of the distortion and coloring variants, i.e., MgZn₂, URe₂, Mg₂Cu₃Si and Mg₂MnGa₃ are discussed on the basis of a Bärnighausen tree. The electronic structure calculation data indicate that in addition to the metallic type of bonding an additional covalent interaction appears between the Ga–Ga and Mn–Ga atoms.

Keywords: intermetallics; Laves phase; Mg2MnGa3 ; superstructure

Corresponding author: Rainer Pöttgen, Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany, E-mail: pottgen@uni-muenster.de

Acknowledgements

We thank Dipl.-Ing. U. Ch. Rodewald for the intensity data collection.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-07-18

Accepted: 2022-08-02

Published Online: 2022-08-29

Published in Print: 2022-10-26

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https://doi.org/10.1515/znb-2022-0109

Keywords for this article

intermetallics; Laves phase; Mg2MnGa3; superstructure