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|Title:||CaTh(PO4)2 cheralite as a candidate ceramic nuclear waste form: Spark plasma sintering and physicochemical characterisation|
|Authors:||POPA KARIN; COLOGNA MARCO; MARTEL LAURA; STAICU Dragos; CAMBRIANI ANDREA; ERNSTBERGER Markus; RAISON Philippe; SOMERS Joseph|
|Citation:||JOURNAL OF THE EUROPEAN CERAMIC SOCIETY vol. 36 no. 16 p. 4115-4121|
|Publisher:||ELSEVIER SCI LTD|
|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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