Isfahan University of Technology,
The Physics Society of IranIranian Journal of Physics Research1682-695723120230522Calculation of thermal conductivity of UO2±0.25 solving phonon Boltzmann equationCalculation of thermal conductivity of UO2±0.25 solving phonon Boltzmann equation16335110.47176/ijpr.23.1.51457FASamira SheykhiPhysics and Accelerators Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Northen Kargar St., Tehran, IranMahmoud Payami ShabestarPhysics and Accelerators Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Northen Kargar St., Tehran, Iran0000-0001-9670-8457Mohammad Reza BasaadatPhysics and Accelerators Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Northen Kargar St., Tehran, IranJournal Article20220523In this study, the effect of point defects on the thermal conductivity of UO<sub>2</sub> is investigated. Especially, the effects of oxygen vacancy and interstitial are considered. Thermal conductivity of UO<sub>2</sub>, UO<sub>2+0.25</sub> and UO<sub>2-0.25</sub> is calculated by solving the phonon Boltzmann equation (BTE) under the relaxation time approximation (RTA). The results show that introducing any defects to the lattice structure of UO2 decreases thermal conductivity significantly. In addition, the results show that the variation of the thermal conductivity of UO<sub>2-0.25</sub> is much lower than that of UO<sub>2+0.25 </sub>in the temperature interval of 300 to 1000 Kelvin.In this study, the effect of point defects on the thermal conductivity of UO<sub>2</sub> is investigated. Especially, the effects of oxygen vacancy and interstitial are considered. Thermal conductivity of UO<sub>2</sub>, UO<sub>2+0.25</sub> and UO<sub>2-0.25</sub> is calculated by solving the phonon Boltzmann equation (BTE) under the relaxation time approximation (RTA). The results show that introducing any defects to the lattice structure of UO2 decreases thermal conductivity significantly. In addition, the results show that the variation of the thermal conductivity of UO<sub>2-0.25</sub> is much lower than that of UO<sub>2+0.25 </sub>in the temperature interval of 300 to 1000 Kelvin.https://ijpr.iut.ac.ir/article_3351_1df4eb96c9db226680fb193ff6b2cd05.pdf