EDP Sciences Journals List
Issue J. Phys. IV France
Volume 03, Number C9, Décembre 1993
Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
Page(s) C9-477 - C9-483
DOI http://dx.doi.org/10.1051/jp4:1993951

Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
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. Poillerat2

1  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