A mechanism of nucleation during thermal decomposition of solids |
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| Authors: | Loïc Favergeon Michèle Pijolat Céline Helbert |
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| Affiliation: | (1) LPMG CNRS UMR 5148 Centre SPIN, Ecole Nationale Supérieure des Mines, 158 Cours Fauriel, 42023 Saint-Etienne Cedex 02, France;(2) Département 3MI, Ecole Nationale Supérieure des Mines, 158 Cours Fauriel, 42023 Saint-Etienne Cedex 02, France |
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| Abstract: | A microscopic model based on the appearance, diffusion, and aggregation of point defects allows to calculate the time of appearance
of the first nucleus on a surface during a reaction between a solid and a gas. Calculated distributions of these times of
appearance of the first nucleus are qualitatively compared to experimental ones, previously determined. The appearance of
the point defects seems to be the most influential step on the time of appearance of the first nucleus. Moreover the comparison
between experimental and calculated distributions allows to conclude that the frequency of appearance of the defects is higher
on the edges than on the faces of the single crystal. |
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