|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Materials Engineering for Nuclear Reactor Applications
||Thermodynamic Modeling of Complex Oxide Phases in U-M-O Systems where M = Ce, Nd, Pr, La, Y, Gd, and Th
||Jacob McMurray, Dongwon Shin, Stewart Voit, Robbie Brese, Ben Slone, Suengmin Lee, Theodore Besmann
|On-Site Speaker (Planned)
Application of thermodynamics is an important component of physics based fuel performance modeling efforts since it provides fundamental inputs, such as chemical potentials and thermal properties, for phase transformation, microstructure evolution, and continuum transport simulations. Using the CALPHAD (Calculations of Phase Diagrams) method, the thermodynamics of key U-M-O systems are assessed where M represents high yield fission products Ce, Pr, La, Y, and Nd or interesting additions like Gd and Th. Equilibrium oxygen pressures over U1-yMyO2±x were obtained from thermogravimetric measurements and used together with those reported in the literature along with phase relation and other experimentally determined thermodynamic values to fit adjustable parameters of CALPHAD models. These assessments provide a thermodynamic description of each subsystem that can be combined for higher order multi-component representations for better understanding chemical behavior of fuel with burn-up.
Research supported by the US Department of Energy, Office of Nuclear Energy, Fuel Cycle Technology Program.
||Planned: A print-only volume