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Actinide and lanthanide oxides and hydroxides are important compounds in the problematics of high level waste disposal as they, and other related compounds, may appear as solid phases as the result of the interaction of waste with natural waters. This paper presents recent results on the thermochemistry of Np(2)O(5)(cr), NpO(2)OH.[2.5H(2)O(am)], Nd(OH)(3).[H(2)O(am)] and Nd(OH)(3)(cr). The enthalpies of solution have been measured and standard molar enthalpies of formation have been calculated. The stability of these phases is discussed in relation to literature data on solubilities and standard molar enthalpies of formation.

Additional information

Authors: MERLI L, University of Liège (Sart Tilman), Laboratory of Analytical Chemistry and Radiochemistry (BE);FUGER J, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: 4th International Conference on Chemistry Migration Behaviour of Actinides and Fission Products in the Geosphere (MIGRATION '93), Charleston (US), December 12-17, 1993
Availability: Available from (1) as Paper EN 37469 ORA
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