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Structure of the Al2Cu(001) and Al9Co2(001) surfaces: role of the covalent-like bonding network and off-stoichiometric effects

Published online by Cambridge University Press:  25 February 2013

Émilie Gaudry ,
Sebastián Alarcón Villaseca ,
Julian Ledieu ,
Jean-Marie Dubois  and
Vincent Fournée
Émilie Gaudry
Affiliation:
Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, Parc de Saurupt, 54011 Nancy, France
Sebastián Alarcón Villaseca
Affiliation:
Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, Parc de Saurupt, 54011 Nancy, France
Julian Ledieu
Affiliation:
Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, Parc de Saurupt, 54011 Nancy, France
Jean-Marie Dubois
Affiliation:
Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, Parc de Saurupt, 54011 Nancy, France
Vincent Fournée
Affiliation:
Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, Parc de Saurupt, 54011 Nancy, France
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Abstract

The Al2Cu and Al9Co2 intermetallic compounds share structural similarities: they are bothdescribed in terms of coordination polyedra with a tetragonal symmetry and covalent-like bonding occur in both compounds. In this paper, the (001) surface structure of Al2Cu and Al9Co2 is described based on a combined scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), X-ray and ultraviolet photoemission spectroscopy (XPS and UPS) and density functional theory (DFT) study. Surface models are elaborated from stoichiometric ideal compounds, leading to a pure aluminium plane as the surface termination in both cases. The nature of the constitutional defect in Al9Co2 is determined using density functional theory calculations. The influence of the surface atomic density, of the surface composition and of off-stoichiometric effects on the (001) surface structures of Al2Cu and Al9Co2 are discussed.

Keywords

alloybondingdefects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1517: Symposium KK – Complex Metallic Alloys , 2013 , mrsf12-1517-kk02-06
Copyright
Copyright © Materials Research Society 2012

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