Chris A. Marianetti¹; ¹Columbia University

State-of-the-art first-principles techniques have been used to calculate the space group irreducible cubic and quartic phonon interactions in ThO2. Phonon linewidths are predicted using perturbation theory in addition to classical mechanics; and the results are compared to recent experimental measurements. Additionally, the phonon interactions are used to predict thermal conductivity both via the Boltzmann Equation and linear response in the classical limit; and these results are compared to experiment. Finally, attention is given to oxygen sublattice melting and its affect on thermal conductivity and other relevant observables.