Interfacial Thermal Transport at (001) Twist Grain Boundaries in UO2

Published: July 21st, 2016

Category: Recent Publications

B. Deng, A. Chernatynskiy, S. B. Sinnott and S. R. Phillpot, Interfacial Thermal Transport at (001) Twist Grain Boundaries in UO2, Journal of Nuclear Materials 479, 167-173 (2016). doi:10.1016/j.jnucmat.2016.06.054

We use phonon wave-packet dynamics to study the phonon transmission at UO2 twist grain boundaries as a function of phonon frequency, mode and incident angle. We find that grain boundaries with more disordered structures show stronger phonon transmission than more ordered grain boundaries. The transmission coefficients are used to calculate the grain boundary thermal conductance at elevated temperature.