Self-Diffusion of Er in Pure and HfO2-Doped Polycrystalline Er2O3 |
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Authors: | R W SCHEIDECKER M F BERARD |
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Affiliation: | Ames Laboratory-USDOE and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011 |
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Abstract: | Using a tracer sectioning technique, the self-diffusion of Er in pure and HfO2-doped polycrystalline Er2O3 was measured at 1614° to 1900°C. Up to ? 10 mol% HfO2 dopant level, the Er self-diffusion coefficients followed a relation based on cation vacancies as the principal mobile defects present and available for cation diffusion. Above 10 mol% HfO2, deviation from this relation occurred, apparently due to clustering of cation vacancies and oxygen interstitials around the dopant hafnium ions. The activation energy for the self-diffusion of Er in pure Er2O3 was 82.2 kcal/mol and increased with the HfO2 dopant level present. |
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