Mechanisms of Radiation Defect Formation in the KI Crystal in the Deformation Field

The study of the mechanisms of formation of radiation defects to ensure the transparency of optical materials under the influence of radiation, temperature and stress of various types of deformation is an urgent task at the present time. For this purpose, the mechanisms of formation of halogen centers (V2, V3, V4A) when the lattice symmetry is lowered by the light cation field (Na), plastic and elastic deformation in a KI, KCl and KBr crystals are studied. Absorption spectra of this crystals under X-ray irradiation in the isodose mode for 3 hours at 90 K, pre-doped with Na ions, undergo plastic deformation (4%) at room temperature and elastic deformation (1.5%) at 90 K. Lowering the lattice symmetry by light cations and plastic deformation of the KI, KCl and KBr crystals leads to an increase in radiation defect formation, elastic deformation – leads to a decrease in radiation defect formation, and therefore to an increase in luminescence.