Abstract
The behavior of metallic niobium in pure water vapor (without added oxygen) was studied between 800 and 1000°C. Linear kinetics curves were observed (except for a short initial period) with a homographic influence of H2O pressure. Hydrogen additions in the gas phase largely modified the reaction rates. The oxide formed (NbO2) is different from that predicted by thermodynamics (Nb2O5). Taking into account all these experimental observations, a mechanism is proposed in which the limiting step is oxygen incorporation into the oxide lattice.
Similar content being viewed by others
References
B. Cox and C. Johnston, Trans. Metall. Soc. AIME 227, 37 (1963).
H. Gerischer, Photoelectrochemistry, Photocatalysis and Photoreactors. Schavello, ed. (1985), pp. 39–106.
I. Barin, Thermochemical Data of Pure Substances (VCH, Weinheim, 1989).
O. Toshiaki and N. Tadayuki, Nippon Kinzoku Gakkaishi 34, 1163 (1970).
W. Kai and R. T. Huang, Oxid. Met. 48, 439 (1997).
D. E. Scaife, Solar Energy 25, 41 (1980).
P. Kofstad and M. Kjøllesdal, Trans. Metall. Soc. AIME 221, 285 (1961).
F. A. Kröger and H. J. Vink, Solid State Physics, Vol. 3, F. Seitz and D. Turnbull eds. (Academic Press, New York, 1956), p. 307.
A. Galerie, Y. Wouters, and J.-P. Pettit, Mater. Sci. Forum 251–254, 113 (1997).
Y. Wouters, A. Galerie, and J.-P. Pettit, Solid State Ionics 104, 89 (1997).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Passier, F., Wouters, Y., Galerie, A. et al. Thermal Oxidation of Metallic Niobium by Water Vapor. Oxidation of Metals 55, 153–163 (2001). https://doi.org/10.1023/A:1010385427776
Issue Date:
DOI: https://doi.org/10.1023/A:1010385427776