Structural Investigation of the (001) Surface of the Al9Co2 Complex Metallic Alloy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2011

Structural Investigation of the (001) Surface of the Al9Co2 Complex Metallic Alloy

Sebastian Alarcon Villaseca
  • Fonction : Auteur
  • PersonId : 788409
  • IdRef : 163605971
Julian Ledieu
Marie-Cécile de Weerd
  • Fonction : Auteur
  • PersonId : 877005
Vincent Fournée
Jean-Marie Dubois
Emilie Gaudry
Connectez-vous pour contacter l'auteur

Résumé

We present a detailed study of the (001) surface of the Al9Co2 crystal using both experimental methods and first-principles calculations based on the density functional theory. Experimentally, the (1 × 1) low-energy electron diffraction pattern combined with the composition determined using X-ray photoemission spectroscopy is consistent with a bulk terminated surface. In addition, scanning tunneling microscopy (STM) measurements highlights the presence of only one type of surface termination. Combining experimental results with electronic structure calculations provides many arguments to correlate the observed surface termination with the dense pure aluminum layer present in the Al9Co2 bulk structure: (i) calculations show that this termination presents a lower surface energy compared to another conceivable termination obtained also from bulk truncation, (ii) step height measurements are consistent with calculated interlayer spacings, (iii) calculated broadened densities of states and simulated STM images are qualitatively in agreement with the experimental photoelectron spectra and the experimental STM images.
Fichier non déposé

Dates et versions

hal-00974222 , version 1 (05-04-2014)

Identifiants

Citer

Sebastian Alarcon Villaseca, Julian Ledieu, Laura Serkovic Loli, Marie-Cécile de Weerd, Peter Gille, et al.. Structural Investigation of the (001) Surface of the Al9Co2 Complex Metallic Alloy. Journal of Physical Chemistry C, 2011, 115 (30), pp.14922-14932. ⟨10.1021/jp203727h⟩. ⟨hal-00974222⟩
69 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More