Abstract
MgAl2Se4, MgAl2Se4:Co2+, CaAl2Se4 and CaAl2Se4:Co2+ single crystals were grown by the chemical transport reaction method in a closed system using iodine as a transport agent. The MgAl2Se4 and MgAl2Se4:Co2+ single crystals crystallized into a hexagonal (rhombohedral) structure, and the CaAl2Se4 and CaAl2Se4:Co2+ single crystals crystallized into an orthorhombic structure. The optical energy gaps of the MgAl2Se4, MgAl2Se4:Co2+, CaAl2Se4 and CaAl2Se4:Co2+ single crystals at 10 K were found to be 3.286 eV, 2.596 eV, 3.823 eV and 3.082 eV, respectively. The impurity optical absorption peaks were observed in the MgAl2Se4:Co2+ and CaAl2Se4:Co2+ single crystals and analysed to appear as a result of the electron transitions between energy levels of the Co2+ ion in sites of Td symmetry.
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