Defects induced in cerium dioxide single crystals by electron irradiation
- DEN, Service de Recherches Metallurgiques Appliquees, CEA, Universite Paris-Saclay (France)
- DEN, Service de Recherches de Metallurgie Physique, CEA, Universite Paris-Saclay (France)
- Chimie Paris-Tech, PSL Research University, Institut de Recherche de Chimie-Paris (France); Sorbonne Universite, UPMC (France)
- Institut de Mineralogie, de Physique des Materiaux et Cosmochimie (IMPMC), Sorbonne Universites-UPMC Univ Paris (France). Museum National d Histoire Naturelle
- 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
Web of Science
Optical spectroscopy study of modifications induced in cerium dioxide by electron and ion irradiations
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journal | April 2019 |
Investigation of the influence of irradiation with Fe +7 ions on structural properties of AlN ceramics
|
journal | June 2018 |
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