Chemical and environmental stability of monazite-cheralite solid solutions Ln1-2Ca Th PO4 (Ln = Pr, Nd; x = 0–0.15): A thermodynamic study - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Applied Geochemistry Année : 2023

Chemical and environmental stability of monazite-cheralite solid solutions Ln1-2Ca Th PO4 (Ln = Pr, Nd; x = 0–0.15): A thermodynamic study

Résumé

Monazite-cheralite ceramics are a promising waste form for actinides. To elucidate the longterm behavior of this matrix in aqueous solutions, this study measured thermodynamic data for Thrhabdophanes Ln 1-2x Ca x Th x PO 4 •nH 2 O (with Ln = Pr, Nd; x = 0-0.15) and the associated anhydrous monazite-cheralites Ln 1-2x Ca x Th x PO 4. Solubility experiments at 298 K and high temperature oxide melt solution calorimetry were combined for calculation of , and of Th-rhabdophanes and associated monazite-cheralites. Standard solubility constants were employed in a geochemical simulation using the PHREEQC software, the results of which confirmed the high chemical stability of the monazite-cheralite phases and supported their use as a specific conditioning matrix for the long-term immobilization of actinides.

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Chimie
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Dates et versions

hal-04093146 , version 1 (09-05-2023)

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Danwen Qin, Anna Shelyug, Stéphanie Szenknect, Adel Mesbah, Nicolas Clavier, et al.. Chemical and environmental stability of monazite-cheralite solid solutions Ln1-2Ca Th PO4 (Ln = Pr, Nd; x = 0–0.15): A thermodynamic study. Applied Geochemistry, 2023, 148, pp.105504. ⟨10.1016/j.apgeochem.2022.105504⟩. ⟨hal-04093146⟩
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