V centers in single crystal Al2O3

Computer Modelling of Radiation Damage in Cation Sublattice of Corundum

“…The high mobility of cation interstitials is also confirmed by the experimental results on both MgO [32] and Al 2 O 3 [33] where under low-temperature neutron irradiation, the optical absorption bands associated with anion vacancies are strongly enhanced, unlike bands associated with cation vacancies. These results may be understood if mobile cation interstitials recombine with their vacancies [34].…”

Oxidation/Reduction Effects on the Thermoluminescence of?-Al2O3 Single Crystals

“…2). From literature data [20], hole trapping at aluminium-vacancies may be considered as the origin of this absorption band. On the other hand, the UV absorption bands in the 190 to 260 nm region decrease after X-ray exposure that might be due to electron trapping at impurities.…”

Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO<inf>3</inf>

“…The generated hole would be captured by the trivalent cationic vacancy, which induces the hole center. In Al 2 O 3 , the combination of a hole and an Al 3+ vacancy with or without a positive monovalent or divalent substitute is assigned to a broad optical absorption, which is composed of several components around 3.0 eV [3][4][5]10]. Assuming that quite a similar assignment is applicable to LaAlO 3 , the absorption increase observed at around 3.0 eV, which is composed of at least two components at 2.7 and 3.5 eV as shown in Fig.…”