Microstructural evolution in cerium dioxide irradiated with heavy ions at high temperature

Takeshi Minara, Hiroaki Abe, Takeshi Sonoda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Formation of subdivided grains and coarsened bubbles in uranium dioxides under high burn-up conditions in nuclear power plants deteriorate the performance of nuclear fuels. To clarify its mechanism, heavy ion irradiations in cerium dioxide followed by Raman spectroscopy, X-ray diffractometry and electron microscopy (SEM) were performed. At the early stage of irradiations, increase in the lattice constant and shift in the F2g peak position were observed presumably indicating accumulation of oxygen vacancies. Further irradiation enhanced recombination or clustering of vacancies depending on the irradiation temperature. The behaviors affect the surface morphology of the sample as well. Especially above 1000K. characteristic changes in Raman spectra and surface features were detected, presumably attributable to remarkable diffusion of vacancies. The relation between displacement of F2g position and electronic energy deposition of incident ions was observed, suggesting the role of electronic excitations on the formation of oxygen vacancies in cerium dioxide.

Original languageEnglish
Pages (from-to)1084-1088
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number12
Publication statusPublished - 2007 Dec


  • Cerium dioxide
  • Ion irradiation
  • Raman spectroscopy
  • Scanning electron microscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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