Models of thermophysical properties of uranium dioxide

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Devyatko, Yu N.^1 ; Novikov, V.V.^2 ; Kuznetsov, V.I.^2 ; Khomyakov, O.V.^1 ; Chulkin, D.A.^2

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, 31 Kashirskoe highway, Moscow

115409, Russia^1

Join Stock Company, A.A. Bochvar High-Technology Research Institute of Inorganic Materials, 5a Rogova st., Moscow

123098, Russia^2

关键词: Abnormal growth;    Constant volumes;    Developed model;    Fitting parameters;    High temperature;    Phonon spectrum;    Physical model;    Thermal conductivity coefficient;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012061/pdf
DOI  :  10.1088/1757-899X/130/1/012061

来源: IOP

【 摘 要 】

Physical models of specific heat at constant volume and thermal conductivity of uranium dioxide are developed based on phonon spectrum data. It is explained an abnormal growth of thermal conductivity coefficient of oxide nuclear fuel in high temperature region. It is shown that the contribution from charge carrier's degrees of freedom into observed thermal conductivity coefficient of uranium dioxide can be neglected up to melting point. Developed models of thermophysical properties do not contain fitting parameters.