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Synthesis and sintering of a monazite brabantite solid solution ceramic for nuclear waste storage

Abstract : Various geological arguments suggest that monazite can be an interesting waste-form for actinides such as Np, Pu, Cm and Am. We set up a simple procedure for making dense pellets of monazite brabantite solid solution ceramics with composition Ca0.092Th0.092Ce0.089La0.727PO4. It consists of co-milling CaCO3, ThO2, CeO2, La2O3, and NH4H2PO4, 1250 °C calcination, milling, cold-pressing, and sintering at 1450 °C for 4 h. X-ray investigations showed that the reaction scheme from oxides to monazite is complex and involves various P+La-based intermediate compounds. The final density of the the product is around 95% of the theoretical density. The texture is homogeneous with a typical grain of size 5 20 ?m. This process is designed to be adapted to hot cells and telemanipulators.
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https://hal.archives-ouvertes.fr/hal-00319430
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Submitted on : Monday, September 8, 2008 - 2:24:11 PM
Last modification on : Wednesday, November 18, 2020 - 6:06:02 PM

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Jean-Marc Montel, Benoit Glorieux, Anne-Magali Seydoux-Guillaume, Richard Wirth. Synthesis and sintering of a monazite brabantite solid solution ceramic for nuclear waste storage. Journal of Physics and Chemistry of Solids, Elsevier, 2006, 67, pp.2489-2500. ⟨10.1016/J.JPCS.2006.07.004⟩. ⟨hal-00319430⟩

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