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The thermal- and photo-induced transformations of luminescence centers in anion-defective crystals of α-Al2O3 have been investigated. It has been found that the exposure of crystals to ultraviolet light at temperatures in the range 50–900°C leads to substantial changes in their thermoluminescence and radioluminescence spectra. According to the optical absorption and photoluminescence data, the detected F-type centers have been identified and the temperature ranges of the F → F + → F 2 transformations and their possible mechanisms have been determined. The special attention has been drawn to the detailed similarity in the formation of complex F 2-type centers in the initially perfect α-Al2O3 crystals irradiated with fast neutrons and in the studied anion-defective crystals.
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Solov’ev et al. (2012) studied this question.
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