The role of nanocerianite (CeO₂) in the stability of Ce carbonates at low-hydrothermal conditions.

ABSTRACT: The formation of cerianite (CeO₂) was investigated at low hydrothermal conditions (35-205 °C) via two experimental settings: (1) crystallisation from solution experiments, and (2) replacement of Ca-Mg carbonates (calcite, dolomite, aragonite) mediated by Ce-bearing aqueous solutions. The solid samples were studied with a combination of powder X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy. The results revealed a multi-step crystallisation pathway: amorphous Ce carbonate → Ce-lanthanite [Ce₂(CO₃)₃·8H₂O] → Ce-kozoite [orthorhombic CeCO₃(OH)] → Ce-hydroxylbastnasite [hexagonal CeCO₃(OH)] → cerianite [CeO₂]. We found that Ce carbonates can decarbonise in

SUBMITTER: Szucs AM 

PROVIDER: S-EPMC9972569 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature