Article ID Journal Published Year Pages File Type
1518681 Journal of Physics and Chemistry of Solids 2006 12 Pages PDF
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 μm. This process is designed to be adapted to hot cells and telemanipulators.

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Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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