Surface stress and surface elasticity of low-index fcc surfaces have been studied using effective medium theory potentials. In addition to total energy calculations giving stress components and elastic data for the surface as a whole, the use of "artificial" atoms with modified size allows to probe stress and elasticity of individual layers. This method of artificial atoms provides a direct way to study the contribution of atomic size to segregation in alloys as well as the driving force of reconstructions driven by surface stress. As an example, we give a qualitative explanation of the face-dependent segregation of Pt-Ni alloys. We also compare results of these atomic-scale calculations with continuum elasticity.
Corresponding author: M. Schmid (schmid).
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