Iranian Journal of Physics Research

Calculation of thermal conductivity of UO2±0.25 solving phonon Boltzmann equation

Document Type : Original Article

Authors

Samira Sheykhi
Mahmoud Payami Shabestar
Mohammad reza Basaadat

Physics and Accelerators Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Northen Kargar St., Tehran, Iran

https://doi.org/10.47176/ijpr.23.1.51457
Abstract
In this study, the effect of point defects on the thermal conductivity of UO2 is investigated. Especially, the effects of oxygen vacancy and interstitial are considered. Thermal conductivity of UO2, UO2+0.25 and UO2-0.25 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 UO2-0.25 is much lower than that of UO2+0.25 in the temperature interval of 300 to 1000 Kelvin.

Keywords

uranium dioxide
phonon Boltzmann equation
thermal conductivity
phonon lifetime
defect
Subjects
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