Diffusion of Oxygen in Near-Stoichiometric α-Nb2O5
- 1 August 1967
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 47 (3) , 1144-1148
- https://doi.org/10.1063/1.1711999
Abstract
Oxygen diffusion coefficients have been determined for near‐stoichiometric α‐Nb2O5 over the temperature range of 850° to 1200°C and the oxygen pressure range of 10−2 to 1 atm. At a constant temperature, the diffusion coefficient is found to be proportional to pO2−1/4. Temperature dependence of the diffusion coefficient at a constant oxygen pressure is expressed (in square centimeters per second) by D=1.72×10−2× exp[— (49.4±3.3 kcal) / RT]. Results are discussed in terms of an oxygen‐vacancy model of nonstoichiometric disorder.Keywords
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