AuNi3Si6 and Au2Ni4Si7: Two New Structure Types Related to the CaF2-Type Structure
- Author(s)
- Matthias Stacher, Herta S. Effenberger, Herbert Ipser, Klaus W. Richter
- Abstract
The two compounds AuNi
3Si
6 and Au
2Ni
4Si
7 were prepared from the elements by arc melting and subsequent annealing at 500 °C. They were investigated by X-ray diffraction (powder and single-crystal methods) and by scanning-electron microscopy which was used for the independent determination of the phase compositions. Both compounds show only minor homogeneity ranges. Single-crystal XRD was used for structure determination. Both title compounds crystallize in new structure types; AuNi
3Si
6 (Pearson symbol hR30, space group R$\bar{3}$m) and Au
2Ni
4Si
7 (Pearson symbol mC26, space group C2/m). The new crystal structures are related to that of NiSi
2 (CaF
2-type); AuNi
3Si
6 may be derived from this structure by a shear operation, while Au
2Ni
4Si
7 may be regarded as intergrowth structure of the CaF
2 and Hg
2Pt-type.
- Organisation(s)
- Department of Physical Chemistry, Department of Mineralogy and Crystallography, Department of Functional Materials and Catalysis, Core Facility Crystal Structure Analysis
- Journal
- Zeitschrift für Anorganische und Allgemeine Chemie
- Volume
- 641
- Pages
- 1428-1434
- No. of pages
- 7
- ISSN
- 0044-2313
- DOI
- https://doi.org/10.1002/zaac.201500109
- Publication date
- 07-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104003 Inorganic chemistry, 104017 Physical chemistry, 104011 Materials chemistry, 105113 Crystallography
- Keywords
- ASJC Scopus subject areas
- Inorganic Chemistry
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/2308232a-ece7-4cee-8281-89c68ded0a8a