Self-diffusion in cr2o3III. Chromium and oxygen grain-boundary diffusion in polycrystals
- 1 September 1992
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 66 (3) , 361-374
- https://doi.org/10.1080/01418619208201562
Abstract
Chromium and oxygen grain-boundary self-diffusion coefficients in Cr2O3 polycrystals were determined by a thick-film method, using the 54Cr isotope and isotopic exchange with 18O. Depth profiling was made by secondary-ion mass spectrometry, and the diffusion coefficients were computed using the Whipple-Le Claire equation for type B intergranular diffusion. Grain-boundary self-diffusion coefficients were determined as a function of temperature and oxygen pressure. The grain-boundary self-diffusion coefficients are lower than the few results given in the literature and do not seem to depend on the oxygen pressure. Moreover, it is found that oxygen grain-boundary diffusion is faster than chromium grain-boundary diffusion.Keywords
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