Structural complexity of the intermetallic compound o-Al13Co4

Simon, Paul; Zelenina, Iryna; Ramlau, Reiner; Carrillo-Cabrera, Wilder; Burkhardt, Ulrich; Borrmann, Horst; Gil, Raul Cardoso; Feuerbacher, Michael; Gille, Peter und Grin, Yuri (2020): Structural complexity of the intermetallic compound o-Al13Co4. In: Journal of Alloys and Compounds, Bd. 820, 153363

Abstract

The crystal structure of the complex intermetallic phase o-Al13Co4 was first investigated in 1994, but some open questions still remained. The new refinement of the crystal structure using high-resolution X-ray diffraction data resulted in a much more complex model including a large number of split positions (space group Pnm2(1), a = 8.1590(6) angstrom, b = 12.349(1) angstrom, c = 14.453(1) angstrom). The model is interpreted in terms of local violation of the translational symmetry, which is confirmed by HRTEM and HRSTEM investigations. Chemical bonding between two partial structures in o-Al13Co4 - three-dimensional framework and linear Co-Al-Co groups in cages of the latter - along with the stacking faults (local twinning) are discussed as possible reasons for such an extended disorder.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Geowissenschaften > Department für Geo- und Umweltwissenschaften
• Themengebiete: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• ISSN: 0925-8388
• Sprache: Englisch