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The oxygen self-diffusion coefficient in UO${_2}$ has been recently studied[Cooper et al. Solid State Ionics 282 (2015) 26-30] over a range of pressures(0-10GPa) and temperatures (300-1900K) by combining molecular dynamicscalculations with a thermodynamical model, the cB{\Omega} model. A significantreduction in oxygen self-diffusion as a function of increasing hydrostaticpressure, and the associated increase in activation energy was identified.Here, we extend this study and find that the compressibility of thecorresponding activation volume exceeds significantly the compressibility ofthe bulk material by almost one order of magnitude. This results is importantsince in the literature it is usually assumed that these two compressibilitiesare equal. The same holds when comparing the thermal expansion coefficient ofthis volume with that of the bulk solid.

Comment on "Modeling oxygen self-diffusion in UO2 under pressure by M.W.D Cooper et al., Solid State Ionics 282 (2015) 26-30"