Abstract
The CALPHAD methodology was used to develop a thermodynamic assessment of the U-La-O system. The solid solution and liquid phases are described with the compound energy formalism (CEF) and the partially ionic two-sublattice liquid model, respectively. Experimental thermodynamic and phase equilibria data published in the open literature were then used in optimizations to develop representations of the phases in the system that can be extended to include other actinide and fission products for multi-component models. The models that comprise this assessment very well reproduce experimentally determined oxygen potentials and the observed phase relations for the U-La-O system.
| Original language | English |
|---|---|
| Pages (from-to) | 142-150 |
| Number of pages | 9 |
| Journal | Journal of Nuclear Materials |
| Volume | 456 |
| DOIs | |
| State | Published - Jan 2015 |
Funding
The authors would like to thank Tom Watkins and Dane Wilson of Oak Ridge National Laboratory for helpful comments. The work was supported by the US Department of Energy, Office of Nuclear Energy Fuel Cycle Technology Program .