Self-diffusion in cr2o3II. Oxygen diffusion in single crystals
- 1 September 1992
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 66 (3) , 351-360
- https://doi.org/10.1080/01418619208201561
Abstract
Oxygen self-diffusion in chromia (Cr2O3) single crystals was studied as a function of oxygen pressure at 1100°C, using the gas-solid isotope exchange method. The diffusion experiments were performed in H2-H2 18O atmospheres. After the diffusion anneal, the 18O diffusion profiles were determined by secondary ion mass spectrometry and the diffusion coefficients were computed using a general solution for the Fick's second law, taking into account evaporation and exchange at the surface. Our results show that oxygen diffusion coefficients at 1100°C do not depend on the oxygen pressure and are smaller than values given in the literature. Comparison with results concerning chromium self-diffusion in the same Cr2O3 single crystals clearly indicates that oxygen diffusion is faster than chromium diffusion.This publication has 4 references indexed in Scilit:
- Self-diffusion in cr2o3I. Chromium diffusion in single crystalsPhilosophical Magazine A, 1992
- OXYGEN SELF-DIFFUSION IN SUBBOUNDARIES OF ALUMINA SINGLE CRYSTALSLe Journal de Physique Colloques, 1990
- Transport processes during the growth of oxide films at elevated temperatureReviews of Modern Physics, 1985
- Anion Diffusion in α‐Cr2O3Journal of the American Ceramic Society, 1965