Study of irradiation temperature effect on change of structural, optical, and strength properties of BeO ceramics when irradiated with Ar8+ and Xe22 heavy ions

A E Ryskulov,M V Zdorovets,D I Shlimas,S B Kislitsin,A L Kozlovskiy,V V Uglov

doi:10.1007/s10854-021-05748-2

Abstract

This paper presents the results of the study of the effect of irradiation temperature on structural and optical distortions and deformations, as well as the strength properties of BeO ceramics as a result of irradiation with Ar8+ and Xe22+ ions at a radiation dose of 5 × 1013 cm-2. The choice of radiation dose is due to the effect of overlapping defective areas arising along the trajectories of ions in ceramics, which makes it possible to model radiation damage caused by the effect of accumulation as a result of cascade collisions and overlapping damaged areas. The temperature range of 300–1000 K was chosen to simulate different operating conditions, as well as the possibility of simulating partial annealing of defects during irradiation at high temperatures. During the research, it was established that high-temperature radiation reduces influence of size of electronic and nuclear power losses of ions of Ar8+ and Xe22+ with energy of 70 MeV and 231 MeV, respectively, on extent of radiation damage of ceramics of BeO. Irradiation at a temperature of 1000 K results in an equal 14% change in dislocation density for these particles, a comparable decrease in the yield intensity of optically stimulated luminescence by 5% and 15%, as well as microhardness by 25% and 30%, respectively.

Highlights

One of the main requirements for structural materials for nuclear reactors is to ensure the stability of operating characteristics such as thermal conductivity, electrical resistance, high radiation and corrosion resistance to external in uences such as radiation, thermal heating, etc. [1-3]
This paper presents the results of the study of the effect of irradiation temperature on structural and optical distortions and deformations, as well as the strength properties of BeO ceramics as a result of irradiation with Ar8+ and Xe22+ ions at a radiation dose of 5х1013 cm-2
The use of ceramics based on oxides, carbides or nitrides, which have a similar nature of physicochemical and strength properties, as structural materials for nuclear power in the XXI century requires studying the resistance of these materials to the effects of ionizing radiation, as well as subsequent processes of defect formation [9-14]

Summary

Introduction

One of the main requirements for structural materials for nuclear reactors is to ensure the stability of operating characteristics such as thermal conductivity, electrical resistance, high radiation and corrosion resistance to external in uences such as radiation, thermal heating, etc. [1-3]. The main sources that create defects in structural materials of nuclear reactors during operation are neutron radiation and fragments of ssion of uranium nuclei with an energy of 50-250 MeV, which can lead to partial disordering and deformation of the structure as a result of the accumulation effect [15-20] In this case, the greater the energy of the incident particles, the more defects are created along the trajectory of the ions in the material. As is known, when materials are heated, partial annealing and relaxation of defects occurs due to changes in the vibrational modes of atoms and subsequent annihilation of point defects with each other [23-25] In this case, during the passage of heavy ions in the material, according to the theory of thermal peaks, regions with an increased temperature are formed along the trajectory of the ions, in which defects are formed [26-30]. The study of the processes of radiation damage to ceramics BeO during high-temperature irradiation with high-energy heavy ions is an urgent and demanded direction of scienti c research in the eld of nuclear technologies

Objectives

Results

Conclusion