Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5454423 | Journal of Nuclear Materials | 2017 | 6 Pages |
Abstract
The enthalpy increment data for the (Th,U)O2 and (U,Pu)O2 solid solutions are reviewed and complemented with new experimental data (400-1773Â K) and many-body potential model simulations. The results of the review show that from room temperature up to about 2000Â K the enthalpy data are in agreement with the additivity rule (Neumann-Kopp) in the whole composition range. Above 2000Â K the effect of Oxygen Frenkel Pair (OFP) formation leads to an excess enthalpy (heat capacity) that is modeled using the enthalpy and entropy of OFP formation from the end-members. A good agreement with existing experimental work is observed, and a reasonable agreement with the results of the many-body potential model, which indicate the presence of the diffuse Bredig (superionic) transition that is not found in the experimental enthalpy increment data.
Keywords
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
S.O. VÄlu, O. BeneÅ¡, D. Manara, R.J.M. Konings, M.W.D. Cooper, R.W. Grimes, C. Guéneau,