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Updated: Jan 29, 2026

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
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Combustion synthesis of (U,Pu)O2 solid solution: from parametric study to sintered pellet.
Anna Hautecouverture1,2, Paul Estevenon2, Elena Bazarkina3,4
1ICSM, Univ Montpellier, CNRS, CEA, ENSCM, Bagnols-sur-Cèze, France.
Dalton Transactions (Cambridge, England : 2003)
|January 28, 2026
Summary
Solution combustion synthesis (SCS) efficiently produced actinide mixed oxides, specifically uranium-plutonium oxides, with desirable nanometric features for nuclear fuel applications.
Area of Science:
- Nuclear Chemistry and Materials Science
- Solid State Chemistry
- Powder Metallurgy
Background:
- Actinide mixed oxides, particularly uranium-plutonium oxides, are crucial for nuclear fuel applications.
- Solution combustion synthesis (SCS) offers a promising route for synthesizing advanced ceramic materials.
- Previous studies showed potential for SCS with surrogate materials and pure actinide oxides.
Purpose of the Study:
- To synthesize actinide mixed oxides using solution combustion synthesis (SCS) with citric acid as fuel.
- To optimize SCS parameters, including fuel amount and Pu/(U + Pu) composition, for desired powder characteristics.
- To evaluate the suitability of the synthesized U,Pu)O2+x powder for nuclear fuel production.
Main Methods:
- Solution combustion synthesis (SCS) utilizing citric acid as a fuel source.
- Systematic variation of fuel quantity and plutonium content (Pu/(U + Pu)) to control powder properties.
- Characterization of synthesized powders for phase, homogeneity, and particle size.
- Pressing and low-temperature sintering tests on selected U0.90Pu0.10O2+x powder.
Main Results:
- A solid solution (U,Pu)O2+x was successfully synthesized under various SCS conditions.
- The resulting actinide mixed oxide powders exhibited homogeneous cationic distribution and nanometric features.
- A U0.90Pu0.10O2+x pellet achieved 88% theoretical density via low-temperature sintering, attributed to the nanometric powder size.
- Sintered pellets showed homogeneous plutonium distribution and expected pore morphology, despite residual carbon presence.
Conclusions:
- Solution combustion synthesis is an effective method for producing nanometric uranium-plutonium mixed oxide powders.
- The synthesized (U,Pu)O2+x powders are suitable for pressing and sintering, demonstrating potential for MOX fuel fabrication.
- Low-temperature sintering is achievable due to the nanometric nature of the SCS-derived powders.
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