| Numéro |
J. Phys. Colloques
Volume 48, Numéro C6, Novembre 1987
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
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|---|---|---|
| Page(s) | C6-209 - C6-214 | |
| DOI | https://doi.org/10.1051/jphyscol:1987634 | |
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
J. Phys. Colloques 48 (1987) C6-209-C6-214
DOI: 10.1051/jphyscol:1987634
1 CRMC2-CNRS, Campus de Luminy case 913, 13288 Marseille cedex 09, France
2 CNRS, Laboratoire d'Optique Electronique, 31055 Toulouse, France
3 A.G. Festkörper-Oberflächen, Universität Bonn, 5300 Bonn, F.R.G.
J. Phys. Colloques 48 (1987) C6-209-C6-214
DOI: 10.1051/jphyscol:1987634
STABLE NECKS ON METAL TIPS
M. Drechsler1, S. Ramdani1, A. Claverie2 et A. Maas31 CRMC2-CNRS, Campus de Luminy case 913, 13288 Marseille cedex 09, France
2 CNRS, Laboratoire d'Optique Electronique, 31055 Toulouse, France
3 A.G. Festkörper-Oberflächen, Universität Bonn, 5300 Bonn, F.R.G.
Abstract
On a metal tip (W, Ni, Au, Cu) heated in an electron microscope (SEM) a formation of stable necks is observed. As this does not agree with the theory, experiments are made for clarification. In situ electron microscopy (TEM, STEM, EELS) shows the existence of graphitized surface layers, which surprisingly remain stable up to near the melting point. These layers hinder a complete separation of a solid metal drop from the tip end. On the basis of this result spectacular tip and neck shape changes are explainable as an Ostwald ripening.