期刊
JOURNAL OF APPLIED PHYSICS
卷 123, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5007823
关键词
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资金
- French EMIR network
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- EPR research network RENARD [FR-CNRS 3443]
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-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 unirradiated 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 4f(1) 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 Fthorn or F-0 center or hole center formation due to irradiation was found from the present EPR and optical absorption spectra. Published by AIP Publishing.
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