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

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5007823· OSTI ID:1422581
 [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

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 (CeO2) single crystals by electron irradiation for three energies (1.0, 1.4, and 2.5 MeV). The Raman-active T2g 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 Ce3+ ions (with the 4f1 configuration) in a high-symmetry local environment. Finally, it is concluded that Ce3+ ions may be produced by a reduction resulting from the displacement damage process. However, no evidence of F+ or F0 center or hole center formation due to irradiation was found from the present EPR and optical absorption spectra.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1422581
Alternate ID(s):
OSTI ID: 1416844
Journal Information:
Journal of Applied Physics, Vol. 123, Issue 2; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (2)

Optical spectroscopy study of modifications induced in cerium dioxide by electron and ion irradiations journal April 2019
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Figures / Tables (8)