Study of Optical Properties of Irradiated AlN Ceramic

Abstract

In the course of research, dependencies of defect formation processes, radiation resistance, changes in structural and optical characteristics of AlN ceramics under irradiation with 40 keV He 2+ ions were established. Evaluation of changes in ceramics properties was carried out using the methods of thermally stimulated luminescence, optical absorption spectrophotometry and X-ray structural analysis. It was found that for irradiated samples, a decrease in optical absorption density spectra is observed with a sharp increase in dichroism, which is caused by an increase in concentration of implanted He ions in the structure, a change in the inter-planar distances, and the formation of regions of disorder as a result of irradiation, leading to a strong distortion of the crystal structure. The change in structural characteristics due to the occurrence of defects and the introduction of helium ions into the lattice leads to a change in ceramics density, with the subsequent formation of porous inclusions in the structure, which significantly affects the optical properties of ceramics.