The Influence of Accumulated Radiolysis Products on the Mechanisms of High-Temperature Degradation of Two-Component Lithium-Containing Ceramics
Kenzhina I.E. Askerbekov S. Kozlovskiy A.L. Tolenova A. Piskunov S. Popov A.I.
September 2025Multidisciplinary Digital Publishing Institute (MDPI)
Ceramics
2025#8Issue 3
One of the advantages of the EPR spectroscopy method in assessing structural defects caused by irradiation is the fact that using this method it is possible to determine not only the concentration dependences of the defect structure but to also establish their type, which is not possible with methods such as X-ray diffraction or scanning electron microscopy. Based on the data obtained, the role of variation in the ratio of components in Li4SiO4–Li2TiO3 ceramics on the processes of softening under high-dose irradiation with protons simulating the accumulation of hydrogen in the damaged layer, as well as the concentration of structural defects in the form of oxygen vacancies and radiolysis products on the processes of high-temperature degradation of ceramics, was determined. It was found that the main changes in the defect structure during the prolonged thermal exposure of irradiated samples are associated with the accumulation of oxygen vacancies, the density of which was estimated by the change in the intensity of singlet lithium, characterizing the presence of E-centers. At the same time, it was found that the formation of interphase boundaries in the structure of Li4SiO4–Li2TiO3 ceramics leads to the inhibition of high-temperature degradation processes in the case of post-radiation thermal exposure for a long time. Also, during the conducted studies, the role of thermal effects on the structural damage accumulation rate in Li4SiO4–Li2TiO3 ceramics was determined in the case when irradiation is carried out at different temperatures. During the experiments, it was determined that the main contribution of thermal action in the process of proton irradiation at a fluence of 5 × 1017 proton/cm2 is an increase in the concentration of radiolysis products, described by changes in the intensities of spectral maxima, characterized by the presence of defects such as ≡Si–O, SiO43− and Ti3+ defects.
degradation , EPR spectroscopy , oxygen vacancies , radiation damage , radiolysis products , two-component lithium-containing ceramics
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Department of General Physics, Satbayev University, 22 Satbayev Street, Almaty, 050013, Kazakhstan
Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, 71 Al-Farabi Avenue, Almaty, 050040, Kazakhstan
Laboratory of Advanced Electronics Development, Kazakh-British Technical University, 59 Tole Bi Street, Almaty, 050000, Kazakhstan
Institute of Solid State Physics, University of Latvia, 8 Kengaraga str, Riga, LV-1063, Latvia
Department of General Physics
Laboratory of Solid State Physics
Institute of Experimental and Theoretical Physics
Laboratory of Advanced Electronics Development
Institute of Solid State Physics
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