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In-Situ High Temperature XRD on U0.54Pu0.46O2−xA Study of the Miscibility Gap

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Abstract

It has been shown in previous studies that a miscibility gap exists in the hypo-stoichiometric region UO2-PuO2-Pu2O3 with one phase poor in oxygen, and the other with an O/M (Oxygen to Metal ratio) close to 2.00. Data on the evolution of this region in temperature, especially in the vicinity of the oxygen content corresponding to the highest temperature at which the gap can be observed, is scarce. A high temperature X-ray diffractometer with a dedicated gas control setup was used to study the described region in-situ. We have observed reflections of the two cubic phases, with one increasing and the other decreasing in intensity during the thermal plateaus lasting up to 20 h. We compare the calculated lattice parameters with literature. We estimated the O/M evolution of our samples from a comparison of phase fractions values obtained by Rietveld refinement and calculations using the Calphad method.

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Authors and Affiliations

  1. CEA, DEN, DEC, SPUA, LMPC, Cadarache, F-13108, Saint-Paul-Lez-Durance, France

    Michal Strach, Renaud C. Belin & Jean-Christophe Richaud

  2. IM2NP, UMR 6122, CNRS- Aix Marseille Université, Case 251, Avenue Escadrille Normandie Niemen, 13397, Marseille Cedex 20, France

    Michal Strach & Jacques Rogez

Authors
  1. Michal Strach
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  2. Renaud C. Belin
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  3. Jean-Christophe Richaud
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  4. Jacques Rogez
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Strach, M., Belin, R.C., Richaud, JC. et al. In-Situ High Temperature XRD on U0.54Pu0.46O2−xA Study of the Miscibility Gap. MRS Online Proceedings Library 1743, 1–6 (2015). https://doi.org/10.1557/opl.2015.370

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  • DOI: https://doi.org/10.1557/opl.2015.370

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