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Improvement of the preparation of sintered pellets of thorium phosphate-diphosphate and associated solid solutions from crystallized precursors

Abstract : Several compositions of thorium–uranium (IV) phosphate–hydrogenphosphate hydrate (Ux/2Th2−x/2(PO4)2(HPO4) · H2O, TUPHPH) were prepared starting from actinides chloride solutions and concentrated phosphoric acid. The experimental synthesis parameters were optimized in order to get the quantitative precipitation of the cations and a good crystallization state. The extensive characterization of the solids demonstrated the existence of a complete solid solution between Th and U end-members and evidenced the good homogeneity of the powders. Their behaviors during heating treatment were then checked and confirm the formation of anhydrous thorium–uranium (IV) phosphate–hydrogenphosphate (TUPHP) and α-UxTh4−x(PO4)4(P2O7) (α-TUPD) acting as intermediates. Finally, the low-temperature crystallized precursors were used in original sintering processes in order to improve the efficiency of the former cold-pressing sintering procedure.
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http://hal.in2p3.fr/in2p3-00087837
Contributor : Dominique Girod <>
Submitted on : Thursday, July 27, 2006 - 10:19:10 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:31 PM

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Nicolas Clavier, N. Dacheux, G. Wallez, M. Quarton. Improvement of the preparation of sintered pellets of thorium phosphate-diphosphate and associated solid solutions from crystallized precursors. E-MRS 2005 Spring Meeting Symposium N on Nuclear Materials (including the 10th Inert Matrix Fuel Workshop), May 2005, Strasbourg, France. pp.209-216, ⟨10.1016/j.jnucmat.2006.02.056⟩. ⟨in2p3-00087837⟩

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