Study of Properties of Irradiated BeO Ceramic

Abstract

The paper presents study results of structural and optical changes in heavy ion irradiated BeO ceramics. Irradiation was carried out on DC-60 heavy ion accelerator using Ni 12+ ions with an energy of 100 MeV with irradiation fluence of 10 13 -10 14 ions/cm2. It has been determined that change in magnitude of atom displacements from lattice sites is exponential, which is conditioned by defect overlap regions occurrence at fluence of 10 14 ions/cm2, followed by formation of a large number of migrating defects in structure, leading to crystal structure distortion and deformation due to chemical bonds rupture. In case of defect overlap areas generation, characteristic for irradiation fluences of 5×10 13 - 10 14 ions/cm2, amorphous-like inclusions formation of more than 5% was observed, that leads to thermal conductivity decrease by 15-20%.