Danwen Qin, Anna Shelyug
Monazite-cheralite ceramics are a promising waste form for actinides. To elucidate the long-term behavior of this matrix in aqueous solutions, this study measured thermodynamic data for Th-rhabdophanes Ln1-2xCaxThx-PO4⋅nH2O (with Ln = Pr, Nd; x = 0–0.15) and the associated anhydrous monazite-cheralites Ln1-2xCaxThxPO4. Solubility experiments at 298 K and high temperature oxide melt solution calorimetry were combined for calculation of ΔG◦f, ΔH◦f and S◦m 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.
@article{28e08ef8-de7c-4b5c-84d4-e76ca18e751a,
title={Chemical and environmental stability of monazite-cheralite solid solutions Ln1-2xCaxThxPO4 (Ln = Pr, Nd; x = 0–0.15): A thermodynamic study},
author={Danwen Qin and Anna Shelyug},
year={2018},
language={en}
}TY - JOUR TI - Chemical and environmental stability of monazite-cheralite solid solutions Ln1-2xCaxThxPO4 (Ln = Pr, Nd; x = 0–0.15): A thermodynamic study AU - Danwen Qin AU - Anna Shelyug PY - 2018 LA - en ER -
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