Anomalous grain growth in the surface region of a nanocrystalline CeO 2 film under low-temperature heavy ion irradiation

P. D. Edmondson, Y. Zhang, S. Moll, T. Varga, F. Namavar, W. J. Weber

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Abstract

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, and 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 temperatures with the primary defect responsible being the oxygen vacancy. The nanocrystalline grains remain in the cubic phase regardless of defect kinetics.

Original languageEnglish (US)
Article number214113
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number21
DOIs
StatePublished - Jun 15 2012

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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