Abstract
Magnesium aluminate spinel single crystals with different stoichiometry, MgAl2O4 (1:1 spinel) and MgO 2.5Al2O3 (1:2.5) were investigated using different optical methods (cathode-, photo- and thermally stimulated luminescence (TSL), optical absorption, “creation spectra” of TSL peaks and phosphorescence by VUV radiation). Low-temperature charge carrier traps and the position of intrinsic UV emission bands depend on the degree of stoichiometry. Antisite defects (ADs), Mg2+ or Al3+ located in a “wrong” cation site (Mg|A1 or Al|Mg) are the main as-grown structural defects, which serve also as efficient traps for electrons and holes as well as seeds for bound excitons. AD concentration is especially high in 1:2.5 spinel. There are several manifestations of ADs (electronic excitations near ADs) in the spectral region of 7–7.5 eV, slightly below the energy gap.
Highlights
Magnesium aluminate spinel is a fascinating material applicable for various applications in science and technology [1]
In as-grown spinel crystals, there can exist a certain amount of VO, and the emission of F+ and/or F centers appears due to Cathodoluminescence intensity thermally stimulated luminescence (TSL) intensity a b
Manifestations of as-grown structural defects have been revealed in magnesium aluminate spinel single crystals with different stoichiometry by means of different optical methods
Summary
Magnesium aluminate spinel is a fascinating material applicable for various applications in science and technology [1]. There are many experimental and modelling studies related to the structural damage of radiationtolerant Mg-Al spinel crystals exposed to dense irradiation of different types high-energy electrons, fast neutrons, swift heavy ions (see [3,5,7,8,9,10,11,12] and references therein).
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