عنوان مقاله [English]
In this study, the electron structure of the α-Al2O3 (Alumina) rhombohedral graft has been investigated. The alpha-alumina structure belongs to the space group R3C and the rhombohedral with two units of formula (10 atoms) in the primary unit cell. Although the most widely used structure is hexagonal, it consists of 12 aluminum atoms and 18 atomic oxygen units, 6 units of formulas. The role of defects in the crystalline network, especially the vacancy defect, is investigated here. The band structure changes are evaluated in the absence of one of the atoms of O or Al. The calculations (show that α-Al2O3 has a direct transition at Γ and the energy gap obtained from the DFT method, is 6.3 eV Also, the depletion effect of O is greater than that of Al on the crystal electron structure: α-Al2O3:C and is effective in increasing the response of this crystal as a detector.