Anomalous grain growth in the surface region of a nanocrystalline CeO2 film under low-temperature heavy ion irradiation
Grain growth and phase stability of nanocrystalline ceria are investigated under ion irradiation at different temperatures. Irradiations at temperatures of 300 and 400 K result in uniform grain growth throughout the film. Anomalous grain growth is observed in thin films of nanocrystalline ceria under 3 MeV Au+ irradiation at 160 K. At this low temperature, significant grain growth is observed within 100 nm from the surface, no obvious growth is detected in the rest of the films. While the grain growth is attributed to a defect-stimulated mechanism at room temperature and above, a defect diffusion-limited mechanism is significant at low temperature with the primary defect responsible being the oxygen vacancy. The nanocrystalline grains remain in the cubic phase regardless of defect kinetics.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1047364
- Report Number(s):
- PNNL-SA-88431; 34899; KP1704020
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, 85(21):Article No. 214113, Journal Name: Physical Review. B, Condensed Matter and Materials Physics, 85(21):Article No. 214113
- Country of Publication:
- United States
- Language:
- English
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