| Numéro |
J. Phys. IV France
Volume 03, Numéro C9, Décembre 1993
Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of MaterialsActes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température |
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| Page(s) | C9-477 - C9-483 | |
| DOI | https://doi.org/10.1051/jp4:1993951 | |
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-477-C9-483
DOI: 10.1051/jp4:1993951
Initial stages of cobalt oxidation by FTIR spectroscopy
M. Lenglet1, J. Lopitaux1, L. Terrier1, P. Chartier2, J.F. Koenig2, E Nkeng2 and G. Poillerat21 Laboratoire de Physicochimie des Matériaux, Université de Rouen, B.P. 08, 76131 Mont Saint Aignan Cedex, France
2 Laboratoire d'Electrochimie et de Chimie Physique du corps solide, URA 405, ULP, 4 rue Blaise Pascal, 67000 Strasbourg, France
Abstract
The behaviour of specular reflectance of cobalt oxides on metal has been studied theoretically (CoO/Co system) and experimentally (Co3O4/Co system; the thin films are obtained by chemical spray pyrolysis) in the infrared region. CoO may be identified by a LO mode at 585 cm-1 and by a TO mode at 345 cm-1. Co3O4 is characterized by five bands respectively at 690 (LO), 660 (TO), 605 (LO), 560 (TO) and 390 cm-1. These experimental results allow the characterization of CoO and Co3O4 grown on metal during the initial stages of thermal oxidation (400-750 °C). For film thicknesses in the range 10-1000 nm, the amounts of CoO and Co3O4 in the duplex structure layers may be estimated by FTIR reflectance spectroscopy. FTIR and XRD studies reveal a cyclic behaviour in the growth of the Co3O4/CoO/Co system.
© EDP Sciences 1993