The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics
The paper presents the results of a study on the application of Raman and UV spectroscopy methods to determine the structural damage kinetics in the near-surface layer of BeO ceramics caused by high-dose irradiation with He2+ ions. Interest in this type of ceramics is due to the combination of its s...
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Elsevier
2024-12-01
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| Series: | Optical Materials: X |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590147824000871 |
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| author | Azamat E. Ryskulov Igor A. Ivanov Artem L. Kozlovskiy Marina Konuhova |
| author_facet | Azamat E. Ryskulov Igor A. Ivanov Artem L. Kozlovskiy Marina Konuhova |
| author_sort | Azamat E. Ryskulov |
| collection | DOAJ |
| description | The paper presents the results of a study on the application of Raman and UV spectroscopy methods to determine the structural damage kinetics in the near-surface layer of BeO ceramics caused by high-dose irradiation with He2+ ions. Interest in this type of ceramics is due to the combination of its structural and thermophysical parameters, making these ceramics one of the promising classes of materials for microelectronics and structural materials for nuclear reactors, with the possibility of operation in conditions of heightened radiation background. According to the conducted studies, it was established that with the irradiation fluence growth, changes in the nature of deformation structural distortions associated with the accumulation of residual mechanical stresses of tensile and compressive types are observed. At irradiation fluences of 1016–5 × 1016 Не2+/cm2, tensile stresses play a dominant role in structural distortions, while the value of compressive stresses at fluence growth makes up a small share in the overall nature of the deformations. Moreover, an elevation in the irradiation fluence above 5 × 1016 He2+/cm2 leads to a rise in the concentration of defects caused by the formation of oxygen vacancies, as well as He-VO type complexes, the presence of which is indicated by the halo intensity growth in the Raman spectra, as well as a change in the intensity of the absorption bands. Analysis of changes in thermophysical parameters revealed that a rise in structural distortions associated with the accumulation of complex defects results in thermal conductivity reduction and a deterioration in heat transfer processes associated with partial amorphization of the damaged layer. Moreover, the established direct relationship between the value of residual mechanical stresses and the degradation of thermal conductivity indicates the cumulative effect of destructive changes caused by irradiation, as well as the influence of diffusion mechanisms on the damaged layer thickness growth. |
| format | Article |
| id | doaj-art-4b5c91f44e4d42fab091a469465496a6 |
| institution | Kabale University |
| issn | 2590-1478 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Optical Materials: X |
| spelling | doaj-art-4b5c91f44e4d42fab091a469465496a62024-12-13T11:01:07ZengElsevierOptical Materials: X2590-14782024-12-0124100375The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramicsAzamat E. Ryskulov0Igor A. Ivanov1Artem L. Kozlovskiy2Marina Konuhova3The Institute of Nuclear Physics of the Republic of Kazakhstan, Almaty, KazakhstanThe Institute of Nuclear Physics of the Republic of Kazakhstan, Almaty, KazakhstanThe Institute of Nuclear Physics of the Republic of Kazakhstan, Almaty, Kazakhstan; L.N. Gumilyov Eurasian National University, Astana, KazakhstanInstitute of Solid State Physics University of Latvia, 8 Kengaraga Str, LV-1063, Riga, Latvia; Corresponding author.The paper presents the results of a study on the application of Raman and UV spectroscopy methods to determine the structural damage kinetics in the near-surface layer of BeO ceramics caused by high-dose irradiation with He2+ ions. Interest in this type of ceramics is due to the combination of its structural and thermophysical parameters, making these ceramics one of the promising classes of materials for microelectronics and structural materials for nuclear reactors, with the possibility of operation in conditions of heightened radiation background. According to the conducted studies, it was established that with the irradiation fluence growth, changes in the nature of deformation structural distortions associated with the accumulation of residual mechanical stresses of tensile and compressive types are observed. At irradiation fluences of 1016–5 × 1016 Не2+/cm2, tensile stresses play a dominant role in structural distortions, while the value of compressive stresses at fluence growth makes up a small share in the overall nature of the deformations. Moreover, an elevation in the irradiation fluence above 5 × 1016 He2+/cm2 leads to a rise in the concentration of defects caused by the formation of oxygen vacancies, as well as He-VO type complexes, the presence of which is indicated by the halo intensity growth in the Raman spectra, as well as a change in the intensity of the absorption bands. Analysis of changes in thermophysical parameters revealed that a rise in structural distortions associated with the accumulation of complex defects results in thermal conductivity reduction and a deterioration in heat transfer processes associated with partial amorphization of the damaged layer. Moreover, the established direct relationship between the value of residual mechanical stresses and the degradation of thermal conductivity indicates the cumulative effect of destructive changes caused by irradiation, as well as the influence of diffusion mechanisms on the damaged layer thickness growth.http://www.sciencedirect.com/science/article/pii/S2590147824000871BeO ceramicsRadiation defectsDisorderingOptical transmittanceOptical density |
| spellingShingle | Azamat E. Ryskulov Igor A. Ivanov Artem L. Kozlovskiy Marina Konuhova The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics Optical Materials: X BeO ceramics Radiation defects Disordering Optical transmittance Optical density |
| title | The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics |
| title_full | The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics |
| title_fullStr | The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics |
| title_full_unstemmed | The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics |
| title_short | The effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of BeO ceramics |
| title_sort | effect of residual mechanical stresses and vacancy defects on the diffusion expansion of the damaged layer during irradiation of beo ceramics |
| topic | BeO ceramics Radiation defects Disordering Optical transmittance Optical density |
| url | http://www.sciencedirect.com/science/article/pii/S2590147824000871 |
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