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

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SHEYKHI S.; Payami Shabestar Mahmoud; Basaadat Mohammad reza

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Journal Paper

Paper Information

Journal: Iranian Journal of Physics Research Year:2023 | Volume:23 | Issue:1( پیاپی 91) Page(s): 1-6

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Information Journal Paper

Title

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

Author(s)

SHEYKHI S. | Payami Shabestar Mahmoud | Basaadat Mohammad reza | Issue Writer Certificate

Keywords

uraniumQ4

dioxideQ4

phonon BoltzmannQ4

equationQ4

thermal conductivityQ4

phonon lifetimeQ4

defectQ4

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.

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