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Title: Defects induced in cerium dioxide single crystals by electron irradiation

In this work, Micro-Raman spectroscopy, X-band electron paramagnetic resonance (EPR) spectroscopy, and UV-visible optical absorption spectroscopy were used to study the damage production in cerium dioxide (CeO 2) single crystals by electron irradiation for three energies (1.0, 1.4, and 2.5 MeV). The Raman-active T 2g peak was left unchanged after 2.5-MeV electron irradiation at a high fluence. This shows that no structural modifications occurred for the cubic fluorite structure. UV-visible optical absorption spectra exhibited a characteristic sub band-gap tail for 1.4-MeV and 2.5-MeV energies, but not for 1.0 MeV. Narrow EPR lines were recorded near liquid-helium temperature after 2.5-MeV electron irradiation; whereas no such signal was found for the virgin un-irradiated crystal or after 1.0-MeV irradiation for the same fluence. The angular variation of these lines in the {111} plane revealed a weak g-factor anisotropy assigned to Ce 3+ ions (with the 4f 1 configuration) in a high-symmetry local environment. Finally, it is concluded that Ce 3+ ions may be produced by a reduction resulting from the displacement damage process. However, no evidence of F + or F 0 center or hole center formation due to irradiation was found from the present EPR and optical absorption spectra.
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ; ORCiD logo [5]
  1. DEN, Service de Recherches Metallurgiques Appliquees, CEA, Universite Paris-Saclay (France)
  2. DEN, Service de Recherches de Metallurgie Physique, CEA, Universite Paris-Saclay (France)
  3. Chimie Paris-Tech, PSL Research University, Institut de Recherche de Chimie-Paris (France); Sorbonne Universite, UPMC (France)
  4. Institut de Mineralogie, de Physique des Materiaux et Cosmochimie (IMPMC), Sorbonne Universites-UPMC Univ Paris (France). Museum National d Histoire Naturelle
  5. Univ. of Tennessee, Knoxville, TN (United States). Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 2; Journal ID: ISSN 0021-8979
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
Country of Publication:
United States
36 MATERIALS SCIENCE; Cerium dioxide; electron irradiation; Raman spectroscopy; electron paramagnetic resonance spectroscopy; UV-visible optical absorption spectroscopy
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1416844