Author/Authors :
Martin، نويسنده , , Philippe and Ripert، نويسنده , , Michel Alain Petit، نويسنده , , Thierry and Reich، نويسنده , , Tobias and Hennig، نويسنده , , Christoph and D’Acapito، نويسنده , , Francesco and Hazemann، نويسنده , , Jean Louis and Proux، نويسنده , , Olivier، نويسنده ,
Abstract :
Mixed oxide (MOX) fuel is usually considered as a solid solution formed by uranium and plutonium dioxides. Nevertheless, some physico-chemical properties of (U1−y, Puy)O2 samples manufactured under industrial conditions showed anomalies in the domain of plutonium contents ranging between 3 and 15 at.%. Cerium is commonly used as an inactive analogue of plutonium in preliminary studies on MOX fuels. Extended X-ray Absorption Fine Structure (EXAFS) measurements performed at the European Synchrotron Radiation Facility (ESRF) at the cerium and uranium edges on (U1−y, Cey)O2 samples are presented and discussed. They confirmed on an atomic scale the formation of an ideal solid solution for cerium concentrations ranging between 0 and 50 at.%.
