EPR and photoluminescence study of irradiated anion-defective alumina single crystals
| Autor: | V. A. Pustovarov, S.F. Konev, V. S. Kortov, D.V. Ananchenko |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Materials science Photoluminescence Annealing (metallurgy) Analytical chemistry Atmospheric temperature range 01 natural sciences Spectral line 030218 nuclear medicine & medical imaging law.invention Ion 03 medical and health sciences Paramagnetism 0302 clinical medicine Nuclear magnetic resonance law 0103 physical sciences Irradiation Electron paramagnetic resonance Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 407:191-196 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2017.06.024 |
| Popis: | Electron paramagnetic resonance (EPR) and photoluminescence (PL) spectra of anion-defective alumina single crystals were measured. Exposure to a dose 10 Gy–1 kGy causes isotropic EPR signal of a complex form, this signal contains narrow and broad components. At the same time, in the PL spectrum alongside with a band of F+-centers (3.8 eV) an additional emission band with the maximum of 2.25 eV is registered. This band corresponds to aggregate F22+-centers which were create under irradiation. By comparing measurements in EPR and PL spectra with further stepped annealing in the temperature range of 773–1473 K of the samples exposed to the same doses, we were able to conclude that a narrow component of isotropic EPR signal is associated with the formation of paramagnetic F22+-centers under irradiation. A wide component can be caused by deep hole traps which are created by a complex defect (VAl2− – F+) with a localized hole. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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