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Stability of the AlF3 (0 1 (1)over-bar 2) surface in H2O and HF environments: An investigation using hybrid density functional theory and atomistic thermodynamics

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Keywords
  • Aluminium Fluoride
  • Surface Stability
  • Atomistic Thermodynamics
  • Hybrid Dft
  • Lewis Acidity

Abstract

Thermodynamic calculations based on hybrid-exchange density functional theory are used to predict the surface structure and stability of alpha-AIF(3) (0 1 1 2) in the presence of gaseous HF and H2O environments. The clean stoichiometric alpha-AIF(3) (0 1 1 2) is predicted to be Lewis acidic. However, under most reaction conditions this surface is unstable with respect to the adsorption of hydroxyl ions. This is consistent with experimental observations. It is predicted that the surface containing no hydroxyl ions could only be realised at high temperatures and under unrealistically dry conditions. (C) 2007 Elsevier B.V. All rights reserved.

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