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Thermodynamic modelling of the plutonium–oxygen system

Guéneau, Christine and Chatillon, Christian and Sundman, Bo Thermodynamic modelling of the plutonium–oxygen system. (2008) Journal of Nuclear Materials, 378 (3). 257-272. ISSN 0022-3115

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.jnucmat.2008.06.013


The published data for the thermodynamic functions and phase equilibria of the plutonium–oxygen system have been examined. Some inconsistencies have been found for oxygen chemical potential and vaporization data of [Pu2O3 + PuO2−x] and PuO2−x domains. As the original chemical potential data were not performed at the same temperature and O/Pu ratio, a chart with fixed temperature and composition ranges was built in order to compare all the experimental data. The discrepancies remain difficult to explain. Thermodynamic models of all the phases have been derived by the least-squares minimization procedure using the Thermo-Calc software. The compound energy formalism with the sublattice models (Pu3+, Pu4+)1(O2−, Va)2 and (Pu3+, Pu4+)2(O2−)3(O2−, Va)1 have been chosen to account for the crystal structure, defect chemistry and thermodynamic properties of respectively PuO2−x and PuO1.61 phases. The liquid phase was described using the ionic two-sublattice model (Pu3+)P(O2−, VaQ−, PuO2, O)Q. The reliability of the refined parameters is demonstrated by calculation of the phase diagram, the thermodynamic properties of the phases and the equilibrium partial pressures in the Pu2O3–PuO2 region. Considering the large uncertainties on the experimental information, an overall good agreement was obtained. To improve the thermodynamic description of the system, some missing experimental data are listed.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Nuclear Materials website : http://www.sciencedirect.com/science/journal/00223115
HAL Id:hal-03590696
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Institut polytechnique de Grenoble (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Laboratory name:
Deposited On:20 Apr 2009 13:24

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