Single crystal growth, crystal structure and surface characterisation of the binary phase Al45Cr7
| Autor: | Vincent Fournée, M.-C. de Weerd, Emilie Gaudry, Julian Ledieu, Pascal Boulet |
|---|---|
| Přispěvatelé: | Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IMPACT N4S, ANR-15-IDEX-0004,LUE,Isite LUE(2015) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
History
Materials science Triangular face chemistry.chemical_element 02 engineering and technology Crystal structure 01 natural sciences Molecular physics Education symbols.namesake Chromium Ab initio quantum chemistry methods 0103 physical sciences [CHIM.CRIS]Chemical Sciences/Cristallography Thin film 010306 general physics Fermi level 021001 nanoscience & nanotechnology Computer Science Applications [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry chemistry symbols [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology Pseudogap Single crystal |
| Zdroj: | IOP Conference Series: Materials Science and Engineering IOP Conference Series: Materials Science and Engineering, IOP Publishing, 2020, Journal of Physics: Conference Series, 1458, pp.012016. ⟨10.1088/1742-6596/1458/1/012016⟩ |
| ISSN: | 1757-8981 1757-899X |
| DOI: | 10.1088/1742-6596/1458/1/012016⟩ |
| Popis: | A single crystal of the Al45Cr7 crystalline approximant has been grown using the Czochralski method. The structure of this phase has been resolved in the C2/m space group. Chromium atoms are systematically surrounded by Al atoms forming a distorted icosahedron. The icosahedra are linked either by a vertex or a triangular face or overlap along a five-fold axis. The (010) surface of this single crystal has been investigated under ultrahigh vacuum and shows a (1x1) termination at specific bulk planes. The terraces have a nanostructured appearance which is ascribed to the preservation of the CrAl12 clusters at the surface. Ab initio calculations shows the presence of a deep pseudogap at the Fermi level, due to both a Hume-Rothery effect combined with strong spd hybridization. The isoelectronic charge densities highlight the fact that the charges are mainly confined within the CrAl12 icosahedron providing support to a certain stability of the clusters which could explain the nanostructured surface morphology encountered. First results on Al thin film deposition on the (010) surface are also reported. |
| Databáze: | OpenAIRE |
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