@article{16be13dfb12e4ee5b70e0edb1fbfae66,
title = "Chemical and environmental stability of monazite-cheralite solid solutions Ln1-2xCaxThxPO4 (Ln = Pr, Nd; x = 0–0.15): A thermodynamic study",
abstract = "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 Ln1-2xCaxThxPO4·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 ΔGf°, ΔHf° and Sm° 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.",
keywords = "Calorimetry, Cheralite, Monazite, Rhabdophane, Solubility, Stability, Thorium",
author = "Danwen Qin and Anna Shelyug and St{\'e}phanie Szenknect and Adel Mesbah and Nicolas Clavier and Nicolas Dacheux and Alexandra Navrotsky",
note = "Funding Information: Ph.D. of Danwen Qin (ICSM) was funded by the China Scholarship Council (CSC). The authors thank B{\'e}atrice Baus-Lagarde (ICSM) for her contribution to ICP-OES analyses. The calorimetric studies were supported as part of the Materials Science of Actinides, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award Number DE-SC0001089. Anna Shelyug was funded in accordance with the state assignment by № AAAA-A19-119031890029-7 from the Ministry of Science and Higher Education of the Russian Federation. Funding Information: Ph.D. of Danwen Qin (ICSM) was funded by the China Scholarship Council (CSC) . The authors thank B{\'e}atrice Baus-Lagarde (ICSM) for her contribution to ICP-OES analyses. The calorimetric studies were supported as part of the Materials Science of Actinides, an Energy Frontier Research Center funded by the U.S. Department of Energy , Office of Science , Basic Energy Sciences under Award Number DE-SC0001089. Anna Shelyug was funded in accordance with the state assignment by № AAAA-A19-119031890029-7 from the Ministry of Science and Higher Education of the Russian Federation . Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",
year = "2023",
month = jan,
doi = "10.1016/j.apgeochem.2022.105504",
language = "English (US)",
volume = "148",
journal = "Applied Geochemistry",
issn = "0883-2927",
publisher = "Elsevier Limited",
}