Defects induced in cerium dioxide single crystals by electron irradiation

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 T...

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Bibliographic Details
Published in:Journal of applied physics 2018-01, Vol.123 (2)
Main Authors: Costantini, Jean-Marc, Miro, Sandrine, Touati, Nadia, Binet, Laurent, Wallez, Gilles, Lelong, Gérald, Guillaumet, Maxime, Weber, William J.
Format: Article
Language:English
Subjects:
Absorption spectra
Anisotropy
Applied physics
Cerium dioxide
Cerium oxides
Crystal defects
Dioxides
Electron irradiation
Electron paramagnetic resonance
electron paramagnetic resonance spectroscopy
Fluence
Fluorite
Helium
MATERIALS SCIENCE
Radiation damage
Raman spectroscopy
Single crystals
Spectrum analysis
UV-visible optical absorption spectroscopy
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Summary: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. 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5007823