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Synthesis, Characterization, Sintering and Leaching of Thorium – Uranium (IV) Phosphate Diphosphate Solid Solutions from Low-Temperature Precursors

Published online by Cambridge University Press:  01 February 2011

Nicolas Dacheux ,
Nicolas Clavier ,
Renaud Podor  and
Philippe Le Coustumer
Nicolas Dacheux
Affiliation:
Radiochemistry Group, IPNO, Bât. 100, University of Paris-Sud-XI, 91406 Orsay, France
Nicolas Clavier
Affiliation:
Radiochemistry Group, IPNO, Bât. 100, University of Paris-Sud-XI, 91406 Orsay, France
Renaud Podor
Affiliation:
LCSM, University of H. Poincaré – Nancy I, BP 239, 54506 Vandœuvre les Nancy, France
Philippe Le Coustumer
Affiliation:
CDGA, University of Bordeaux I, BP 19, Avenue des facultés, 33405 Talence, France
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Abstract

In the field of the immobilization of high level activity and long life radwaste for a deep underground repository, several phosphate matrices were already proposed to delay the release of actinides to the biosphere. Among them, Thorium Phosphate-Diphosphate (TPD) and associated solid solutions were considered. In order to improve the homogeneity of the samples prepared, a new way of preparation based on the precipitation in closed containers, at 150°C, of the Thorium-Phosphate HydrogenPhosphate hydrate (TPHP) or associated Thorium – Uranium (IV) Phosphate HydrogenPhosphate hydrate (TUPHP) was developed. Well crystallized and single phase TUPD solid solutions of general formula Th4−xUxP6O23 were prepared after heating above 950°C. Dense TUPD pellets were also obtained through a two-steps procedure involving a uniaxial pressing of the powder at room temperature then a heating treatment at 1250°C for 10 hours. Several properties of the pellets such as their chemical durability during leaching tests were considered carefully. All the normalized dissolution rates of powdered and sintered TUPD solid solutions remained low by comparison to that reported for several other ceramics studied in the same objective.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD3.4
Copyright
Copyright © Materials Research Society 2004

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References

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