Abstract:
AlN-based ceramics have great prospects for use in the field of structural materials for
reactors of the new generation of GenIV, as well as dosimetric and optical devices. Interest in them is
due to their unique physical and chemical properties, high resistance to degradation and excellent
insulating properties. This work is devoted to the study of changes in the optical and heat-conducting
properties of AlN ceramics as a result of irradiation with Kr15+ and Xe22+ heavy ions with energies
close to those of fission fragments of uranium nuclei, and fluences 1014–1015 ion/cm2
. During the study,
dose relationships of changes in the optical properties of ceramics were established, as well as the
effect of the type of ions on the degree of radiation damage and deterioration of optical characteristics.
It has been found that an increase in the irradiation dose for Kr15+ ions leads to a slight increase in
the depth of electron traps, while for samples irradiated with Xe22+ ions there is a sharp increase in
the depth of occurrence from 5 to 20%, depending on the irradiation dose. For samples irradiated
with Xe22+ ions, the greatest decrease in thermal conductivity was 19%, while for ceramics irradiated
with Kr15+ ions, the maximum decrease was not more than 10%. The results show a significant
resistance of ceramics to radiation damage by Kr15+ ions and negative effects, leading to a decrease in
the resistance of optical and conductive properties of ceramics when irradiated with Xe22+ ions with
doses higher than 5 × 1014 ion/cm2
. Using the X-ray diffraction method, the dependences of structural
distortions and changes in dislocation density in the structure of ceramics on the radiation dose
were established. It has been determined that the main structural changes are associated with the
fragmentation of grains, which result in an increase in the dislocation density, as well as deformation
and distortion of the crystal lattice as a result of the formation of complex defects in the structure.
