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Self-Diffusion of Er and Hf in Polycrystalline Er2O3-Stabilized HfO2
- Source :
- Journal of the American Ceramic Society. 65:511-515
- Publication Year :
- 1982
- Publisher :
- Wiley, 1982.
-
Abstract
- Tracer self-diffusion coefficients for Er and Hf were measured in polycrystalline Er2O3-stabilized HfO2 (fluorite phase) at compositions between 10 and 40 mol% Er2O3 and temperatures between 1700° and 2033°C. In some instances, grain-boundary coefficients were also determined. The Hf volume coefficients were generally slightly smaller than Er coefficients, but neither showed a strong composition dependence, a finding most likely attributable to extensive clustering of charged defects which apparently rendered a large proportion of the “notional” defects essentially immobile. The activation energies for volume coefficients were very large, ranging from 630 to 760 kJ-mol−1, and generally decreased with increasing Er2O3 content.
Details
- ISSN :
- 15512916 and 00027820
- Volume :
- 65
- Database :
- OpenAIRE
- Journal :
- Journal of the American Ceramic Society
- Accession number :
- edsair.doi...........84b63a5ffa49c346dec87718cf7ffe36
- Full Text :
- https://doi.org/10.1111/j.1151-2916.1982.tb10343.x