Abstract
F and F+ centers were produced in Al2O3 single crystal by fast neutrons (En>1.2MeV) irradiation at low fluence (4.4×1016 ncm−2). The evolution of defects intensity as a function of temperature and of time at 493, 623 and 823K was investigated by UV–visible spectrophotometry technique. It can be concluded from the analysis of isochronal and isothermal annealing data, that the F- and F+-centers annealing process is complex. At low annealing temperature (<473K), only F- to F+-center conversion process takes place. At higher temperature (>493K) the annealing is due to the superposition of several mechanisms with different activation energies. According to our results, the activation energies needed for both F- and F+-centers elimination are 0.2, 0.3 and 0.03eV for temperature range of 300–673K, 673–873K and >873K, respectively.
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