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Abstract |
The experimental apparatus for measurement of diffusion coefficient of sulfur atoms adsorbed on a solid surface has been developed on the basis of scanning Auger electron microscopy. By using this app...aratus, the surface diffusion coefficient of sulfur adsorbed on a polycrystalline nickel surface has been measured in a temperature region from 673K to 773 K. The diffusion profile has been analyzed with a Boltzmann-Matano method and the concentration dependence of the diffusion coefficient has been determined: The diffusion coefficient decreases with increase of concentration. The concentration dependence of the frequency factor and the activation energy have been also determined from the temperature dependence of the diffusion coefficient: The activation energy increases with decreases of concentration.show more
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