| Numéro |
J. Phys. Colloques
Volume 49, Numéro C6, Novembre 1988
35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
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| Page(s) | C6-87 - C6-92 | |
| DOI | https://doi.org/10.1051/jphyscol:1988615 | |
35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
J. Phys. Colloques 49 (1988) C6-87-C6-92
DOI: 10.1051/jphyscol:1988615
CRMC2-CNRS, Campus Luminy, Case 913, F-13288 Marseille Cedex 09, France
J. Phys. Colloques 49 (1988) C6-87-C6-92
DOI: 10.1051/jphyscol:1988615
MICROSCOPY OF THE THERMAL ROUGHENING OF CRYSTAL FACES
M. DRECHSLERCRMC2-CNRS, Campus Luminy, Case 913, F-13288 Marseille Cedex 09, France
Abstract
Can thermal roughening be studied microscopically ? Yes, the FIM makes possible a visualization of roughened structures and the FEM makes possible an in situ study of this roughening. Metal crystals (W) have 3 types of faces : (1) close packed faces which do not roughen in the experimental range (T < 1800 K), (2) stepped faces that roughen irreversibly, and (3) a few stepped faces in which roughening is partly reversible. Adsorption can change the roughening. Roughened structures exist often as frozen states, and their special adsorption sites may influence surface reactions.