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

Published online by Cambridge University Press:  27 April 2015

Michal Strach ,
Renaud C. Belin ,
Jean-Christophe Richaud  and
Jacques Rogez
Michal Strach
Affiliation:
CEA, DEN, DEC, SPUA, LMPC, Cadarache F-13108 Saint-Paul-Lez-Durance, France, IM2NP, UMR 6122, CNRS- Aix Marseille Université, Case 251, Avenue Escadrille Normandie Niemen, 13397 Marseille Cedex 20, France
Renaud C. Belin
Affiliation:
CEA, DEN, DEC, SPUA, LMPC, Cadarache F-13108 Saint-Paul-Lez-Durance, France,
Jean-Christophe Richaud
Affiliation:
CEA, DEN, DEC, SPUA, LMPC, Cadarache F-13108 Saint-Paul-Lez-Durance, France,
Jacques Rogez
Affiliation:
IM2NP, UMR 6122, CNRS- Aix Marseille Université, Case 251, Avenue Escadrille Normandie Niemen, 13397 Marseille Cedex 20, France
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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.

Keywords

x-ray diffraction (XRD)phase transformationnuclear materials
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1743: Symposium DD/WW – Materials and Radiation Effects for Advanced Nuclear Technologies , 2015 , mrsf14-1743-dd13-06
Copyright
Copyright © Materials Research Society 2015 

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References

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