Title: CaTh(PO4)2 cheralite as a candidate ceramic nuclear waste form: Spark plasma sintering and physicochemical characterisation
Authors: POPA KARINCOLOGNA MARCOMARTEL LAURASTAICU DragosCAMBRIANI ANDREAERNSTBERGER MarkusRAISON PhilippeSOMERS Joseph
Citation: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY vol. 36 no. 16 p. 4115-4121
Publisher: ELSEVIER SCI LTD
Publication Year: 2016
JRC N°: JRC101894
ISSN: 0955-2219
URI: http://www.sciencedirect.com/science/article/pii/S095522191630382X
http://publications.jrc.ec.europa.eu/repository/handle/JRC101894
DOI: 10.1016/j.jeurceramsoc.2016.07.016
Type: Articles in periodicals and books
Abstract: In order to fulfil the requirements as an actinide waste form, cheralite (CaTh(PO4)2) needs to be stabilisedinto a dense material. Thermal stability studies indicated that heat treatment causes gradual decompo-sition of CaTh(PO4)2into the corresponding oxides above 1550 K. Thus, conventional sintering of thismaterial cannot be applied. However, we demonstrate that rapid densification without decomposition can be achieved by using spark plasma sintering. High density pellets of pure cheralite were producedand the thermal diffusivity and mechanical properties (hardness and elastic modulus) were measured.Within this study,31P MAS NMR was used to complete the structural characterisation of the synthetic cheralite.
JRC Directorate:Nuclear Safety and Security

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