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Self-Diffusion of Er and Hf in Polycrystalline Er2O3-Stabilized HfO2

Authors :
M. F. Berard
R. J. Tesch
C. D. Wirkus
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