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The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions

The formation of cerianite (CeO(2)) 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 sam...

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Autores principales: Szucs, Adrienn Maria, Maddin, Melanie, Brien, Daniel, Rateau, Remi, Rodriguez-Blanco, Juan Diego
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9972569/
https://www.ncbi.nlm.nih.gov/pubmed/36865577
http://dx.doi.org/10.1039/d3ra00519d
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author Szucs, Adrienn Maria
Maddin, Melanie
Brien, Daniel
Rateau, Remi
Rodriguez-Blanco, Juan Diego
author_facet Szucs, Adrienn Maria
Maddin, Melanie
Brien, Daniel
Rateau, Remi
Rodriguez-Blanco, Juan Diego
author_sort Szucs, Adrienn Maria
collection PubMed
description The formation of cerianite (CeO(2)) 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 [Ce(2)(CO(3))(3)·8H(2)O] → Ce-kozoite [orthorhombic CeCO(3)(OH)] → Ce-hydroxylbastnasite [hexagonal CeCO(3)(OH)] → cerianite [CeO(2)]. We found that Ce carbonates can decarbonise in the final stage of the reaction, forming cerianite which significantly increases the porosity of the solids. The redox behaviour of Ce combined with the temperature, and the availability of CO(2)(3−) govern this crystallisation sequence, the sizes, morphologies, and crystallisation mechanisms of the solid phases. Our results explain the occurrence and behaviour of cerianite in natural deposits. These findings also present a simple, environmental-friendly, and cost-efficient method for the synthesis of Ce carbonates and cerianite with tailored structures and chemistries.
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spelling pubmed-99725692023-03-01 The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions Szucs, Adrienn Maria Maddin, Melanie Brien, Daniel Rateau, Remi Rodriguez-Blanco, Juan Diego RSC Adv Chemistry The formation of cerianite (CeO(2)) 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 [Ce(2)(CO(3))(3)·8H(2)O] → Ce-kozoite [orthorhombic CeCO(3)(OH)] → Ce-hydroxylbastnasite [hexagonal CeCO(3)(OH)] → cerianite [CeO(2)]. We found that Ce carbonates can decarbonise in the final stage of the reaction, forming cerianite which significantly increases the porosity of the solids. The redox behaviour of Ce combined with the temperature, and the availability of CO(2)(3−) govern this crystallisation sequence, the sizes, morphologies, and crystallisation mechanisms of the solid phases. Our results explain the occurrence and behaviour of cerianite in natural deposits. These findings also present a simple, environmental-friendly, and cost-efficient method for the synthesis of Ce carbonates and cerianite with tailored structures and chemistries. The Royal Society of Chemistry 2023-02-28 /pmc/articles/PMC9972569/ /pubmed/36865577 http://dx.doi.org/10.1039/d3ra00519d Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Szucs, Adrienn Maria
Maddin, Melanie
Brien, Daniel
Rateau, Remi
Rodriguez-Blanco, Juan Diego
The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions
title The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions
title_full The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions
title_fullStr The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions
title_full_unstemmed The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions
title_short The role of nanocerianite (CeO(2)) in the stability of Ce carbonates at low-hydrothermal conditions
title_sort role of nanocerianite (ceo(2)) in the stability of ce carbonates at low-hydrothermal conditions
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9972569/
https://www.ncbi.nlm.nih.gov/pubmed/36865577
http://dx.doi.org/10.1039/d3ra00519d
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