Interlink between solubility, structure, surface and thermodynamics in the ThO₂(s, hyd)-H₂O(l) system.

ABSTRACT: The impact of temperature on a freshly precipitated ThO₂(am, hyd) solid phase was investigated using a combination of undersaturation solubility experiments and a multi-method approach for the characterization of the solid phase. XRD and EXAFS confirm that ageing of ThO₂(am, hyd) at T = 80°C promotes a significant increase of the particle size and crystallinity. TG-DTA and XPS support that the ageing process is accompanied by an important decrease in the number of hydration waters/hydroxide groups in the original amorphous Th(IV) hydrous oxide. However, while clear differences between the structure of freshly precipitated ThO₂(am, hyd) and aged samples were observed, the characterization methods used in this work are unable to resolve clear differenc

SUBMITTER: Kiefer C 

PROVIDER: S-EPMC9705364 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature