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- W1989211947 abstract "Abstract Clay-based minerals are considered to be an important component in backfill barriers due to both their ability to seal and adsorb radioactive waste and to interact chemically with it under subcritical conditions. Herein, we describe a systematic study of the properties of layered silicates that could affect their hydrothermal reactivity, namely type of layers, octahedral occupancy, origin and total amount of the layer charge, and nature of the interlayer cation. The silicates studied were selected on the basis of their different characteristics associated with these properties and were treated hydrothermally at 300 °C for 48 h in a 7.3 · 10 − 2 M Lu(NO 3 ) 3 · 3.6H 2 O solution. The final products were analyzed by X-ray diffraction and solid-state NMR spectroscopy. All the layered silicates studied were found to be able to generate a Lu 2 Si 2 O 7 phase after hydrothermal treatment under subcritical conditions, thereby confirming the participation of a chemical mechanism of the clay barrier generating phases being stables with temperature and pH conditions. However, the extent of this reaction depends to a large extent on the physicochemical properties of the framework and the interlayer space composition, such as the presence or absence of an octahedral sheet, the degree of occupancy of this sheet, and the origin and total layer charge. Therefore, this study allows tuning the clay mineral framework characteristic that favors the rare earth cations (as trivalent actinide simulator) immobilization." @default.
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- W1989211947 date "2013-06-01" @default.
- W1989211947 modified "2023-10-18" @default.
- W1989211947 title "Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition" @default.
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- W1989211947 doi "https://doi.org/10.1016/j.chemgeo.2013.03.006" @default.
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