Mg2MnGa3 – An orthorhombically distorted superstructure variant of the hexagonal Laves phase MgZn2
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Nazar Pavlyuk
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.
Acknowledgements
We thank Dipl.-Ing. U. Ch. Rodewald for the intensity data collection.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2022 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- In this issue
- Research Articles
- Intermediate ytterbium valence in YbRhSn2
- Intermetallic compounds RE2Ga2Mg (RE = Tb–Tm, Lu) with Mo2B2Fe-type structure
- Synthesis, crystal structure and magnetic properties of mer-tricyanidoiron(III) precursor-based 1D heterobimetallic complexes
- The ternary system Sc–Co–In at 870 K: the isothermal section and the crystal structures of the compounds
- High-pressure synthesis of borate-nitrates: crystal structure of M3B7O13(NO3) (M = Co2+, Ni2+, Cu2+, Zn2+, Cd2+)
- Mg2MnGa3 – An orthorhombically distorted superstructure variant of the hexagonal Laves phase MgZn2
- Lu26 T 17–x In x (T = Rh, Ir, Pt) – first indium intermetallics with Sm26Co11Ga6-type structure
- Orthoamide und Iminiumsalze, CVIa. Kondensationsreaktionen von Orthoamiden der Alkincarbonsäuren mit CH-aciden Methylheterocyclen
Artikel in diesem Heft
- Frontmatter
- In this issue
- Research Articles
- Intermediate ytterbium valence in YbRhSn2
- Intermetallic compounds RE2Ga2Mg (RE = Tb–Tm, Lu) with Mo2B2Fe-type structure
- Synthesis, crystal structure and magnetic properties of mer-tricyanidoiron(III) precursor-based 1D heterobimetallic complexes
- The ternary system Sc–Co–In at 870 K: the isothermal section and the crystal structures of the compounds
- High-pressure synthesis of borate-nitrates: crystal structure of M3B7O13(NO3) (M = Co2+, Ni2+, Cu2+, Zn2+, Cd2+)
- Mg2MnGa3 – An orthorhombically distorted superstructure variant of the hexagonal Laves phase MgZn2
- Lu26 T 17–x In x (T = Rh, Ir, Pt) – first indium intermetallics with Sm26Co11Ga6-type structure
- Orthoamide und Iminiumsalze, CVIa. Kondensationsreaktionen von Orthoamiden der Alkincarbonsäuren mit CH-aciden Methylheterocyclen
