Determination of Tritium Transfer Parameters in Lithium Ceramics Li2TiO3 During Reactor Irradiation Based on a Complex Model
Zholdybayev T. Kulsartov T. Zaurbekova Z. Chikhray Y. Shaimerdenov A. Aitkulov M. Askerbekov S. Kenzhina I. Akhanov A. Yelishenkov A.
September 2025Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2025#18Issue 17
This paper presents the results of determining the parameters of tritium transfer processes in lithium ceramics Li2TiO3 under reactor irradiation conditions. Analysis of sections with a short-term decrease in reactor power allowed numerical determination of the Arrhenius parameters of tritium diffusion (pre-exponential factor and activation energy) based on comparison with in situ experimental data. The obtained values of activation energy (70.2–74.7 kJ/mol) and pre-exponential factor (0.9–2.1 × 10−8m2/s) demonstrate growth with increasing fluence, which is explained by the accumulation of radiation defects in ceramics. A linear dependence was established between D0 and Ea, corresponding to the Mayer–Noldel rule. Unlike previously conducted studies based on a phenomenological approach to assessing only the activation energy of diffusion, in this study, a complex model that takes into account temperature gradients, tritium generation, its diffusion, and release from the surface was used. The applicability of such an integrated approach to the analysis of in situ reactor experiments with lithium ceramics was confirmed, and allowed us to estimate changes in the tritium transfer parameters in lithium ceramics Li2TiO3 depending on the irradiation time.
diffusion , diffusion coefficient , Li2TiO3 , lithium ceramics , modeling , reactor irradiation , tritium
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Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Department of General Physics, Satbayev University, Almaty, 050000, Kazakhstan
Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Advanced Electronics Development Laboratory, Kazakh-British Technical University, Almaty, 050035, Kazakhstan
Institute of Nuclear Physics
Department of General Physics
Institute of Experimental and Theoretical Physics
Al-Farabi Kazakh National University
Advanced Electronics Development Laboratory
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