ANALYSIS OF THE ARRHENIUS SHAPE OF THE DIFFUSION COEFFICIENT ON ANfcc(111) SURFACE

M. Mašín () and Z. Chvoj
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M. Mašín: Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53, Praha 6, Czech Republic
Z. Chvoj: Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53, Praha 6, Czech Republic

Surface Review and Letters (SRL), 2000, vol. 07, issue 03, 219-225

Abstract: We study the temperature and coverage dependence of an effective diffusion barrier assuming an Arrhenius shape of the chemical diffusion coefficient for a system of interacting particles. The previously published model of the diffusion of an fcc (111) surface with bivariate trap is used. The presence of two nonequivalent occupation sites and interaction result in a non-Arrhenius shape of the diffusion coefficient and a coverage- and temperature-dependent effective diffusion barrier. The temperature dependence of effective energyEashows a minimum at low temperatures (at approximately 150 K) for strong interactions. The coverage dependence ofEahas a deep minimum in the vicinity of Θ=1/2, even in a system without interaction.

Date: 2000
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DOI: 10.1142/S0218625X00000324

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