Abstract
Steady-state phase relations in the system UO2+x-CeOz-ZrO2-ThO2 were determined for application to phase relations in high-level crystalline ceramic nuclear waste forms. Samples were treated at 1200°C at an oxygen partial pressure of 21.3 kPa and a total pressure of 101.3 kPa. Phase assemblages were found to be comprised of cubic solid solutions of the fluorite-structure type, solid solutions based on ZrO2, and orthorhombic solid solutions based on U3O8.
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