Surface diffusion of lead on tungsten |
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Authors: | R Morin M Drechsler |
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Institution: | Centre de Recherche sur les Mécanismes de la Croissance Cristalline, CNRS, Campus Luminy, Case 913. F-13 288 Marseille Cedex 9, France |
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Abstract: | Field electron microscopy is used to study the surface diffusion of lead on tungsten. A simple method to measure rough values of the diffusion coefficient and its dependence on sub-monolayer coverage is described and tested. In the region around (001) the displacement energy found is about 1.30 eV/atom up to 1015 atoms/cm2 where it decreases to 0.78 eV/atom. In the residual region except (110) this energy at 1.5×1014 atoms/cm2 is 1.22 eV/atom, it decreases at 4 × 1014 atoms/cm2 to 0.61 eV/atom and increases at 1015 atoms/cm2 to 0.78 eV/atom. Corresponding values of the diffusion coefficient D and of the preexponential D0 are given. The dependence of D on submonolayer coverage is discussed. |
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