Radiation Damage and Recovery in Neutron-Irradiated MgO Crystal
来源期刊：JOURNAL OF RARE EARTHS2006年增刊第1期
论文作者：Ruan Yongfeng Liu Jian Ma Pengfei Liu Changlong Li Wenrun
Key words：MgO; neutron irradiation; defects; absorption spectra;
Abstract: MgO single crystal was irradiated by neutron up to a dose of 5.74×1018 cm-2. The radiation damage and its recovery were studied by means of UV-VIS and EM spectroscopy. The results indicate that the irradiation generates large amount of optically detectable defects such as single anion vacancies (F+ center), anion divacancies (F2) and some higher order defects. Through isochronal annealing, these defects started a series of processes of diminishing and transforming, and finally all disappeared while annealing at 900 ℃. It seems that the absorption bands of 573 nm are resulted from a higher order and more complex aggregated center than that of 424, 451 nm bands.
Ruan Yongfeng1，Liu Jian1，Ma Pengfei1，Liu Changlong1，Li Wenrun1
(1.School of Science, Tianjin University, Tianjin 300072, China)
Abstract:MgO single crystal was irradiated by neutron up to a dose of 5.74×1018 cm-2. The radiation damage and its recovery were studied by means of UV-VIS and EM spectroscopy. The results indicate that the irradiation generates large amount of optically detectable defects such as single anion vacancies (F+ center), anion divacancies (F2) and some higher order defects. Through isochronal annealing, these defects started a series of processes of diminishing and transforming, and finally all disappeared while annealing at 900 ℃. It seems that the absorption bands of 573 nm are resulted from a higher order and more complex aggregated center than that of 424, 451 nm bands.
Key words:MgO; neutron irradiation; defects; absorption spectra;
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