Thermodynamic vacancy model of the surface energetic state of solids
- 25 January 2012
- journal article
- Published by Pleiades Publishing Ltd in Protection of Metals and Physical Chemistry of Surfaces
- Vol. 48 (1) , 42-51
Abstract
Based on the broken-bond concept of metal surface formation, a thermodynamic vacancy model of the surface metal layer (TVM), in which the Gibbs surface energy (ΔG s ) of a metal is defined as the excess adsorption energy of vacancies (N V(s)) in the surface layer of the metal ΔG s = −RTlnN V(s), is developed. The relation is derived from the Gibbs adsorption equation for a metal, which is treated as a binary system that involves atoms and vacancies. TVM enables one to estimate the concentration of vacancies and adatoms on low-index faces of cubic-lattice metals from the literature surface energies evaluated with the use of the surface physics methods. Examples of the application of TVM in the physical chemistry of surfaces and corrosion of metals are given.Keywords
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