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Kinetics of Mg-Ni saponite crystallization from precursor mixtures

Published online by Cambridge University Press:  14 October 2024

Chaoqun Zhang ,
Alain Decarreau ,
Philippe Blanc ,
Fabien Baron ,
Yuhuan Yuan ,
Qi Tao Open the ORCID record for Qi Tao [Opens in a new window] ,
Brian Gregoire Open the ORCID record for Brian Gregoire [Opens in a new window] ,
Jianxi Zhu Open the ORCID record for Jianxi Zhu [Opens in a new window] ,
Hongping He  and
Sabine Petit Open the ORCID record for Sabine Petit [Opens in a new window]
Chaoqun Zhang
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China CNRS, Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers-IC2MP, 86022 Poitiers, France
Alain Decarreau
Affiliation:
CNRS, Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers-IC2MP, 86022 Poitiers, France
Philippe Blanc
Affiliation:
Bureau de recherches géologiques et minières (BRGM), 3 Avenue C. Guillemin, BP6009, F-45060 Orléans, France
Fabien Baron
Affiliation:
CNRS, Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers-IC2MP, 86022 Poitiers, France
Yuhuan Yuan
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
Qi Tao
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
Brian Gregoire
Affiliation:
CNRS, Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers-IC2MP, 86022 Poitiers, France
Jianxi Zhu
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
Hongping He*
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
Sabine Petit*
Affiliation:
CNRS, Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers-IC2MP, 86022 Poitiers, France
*
Corresponding authors: Hongping He and Sabine Petit; Emails: [email protected], [email protected]
Corresponding authors: Hongping He and Sabine Petit; Emails: [email protected], [email protected]
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Abstract

Smectite growth is of importance across various fields due to its abundance on the surface of both Earth and Mars. However, the impact of the crystallinity of initial materials on smectite growth processes remains poorly understood. In this study, the kinetic processes of smectite growth were examined via experimental synthesis of trioctahedral Mg-Ni saponites. Mg-Ni saponites were synthesized using mixed precursors, specifically end-member Mg-saponite and Ni-saponite, which exhibit different crystallinities. The crystal chemistry and morphology of samples were analyzed using X-ray diffraction, Fourier-transform infrared spectroscopy, and high-angle annular dark-field scanning transmission electron microscopy. The experimental results converge towards these main conclusions: (i) the formation of Mg-Ni saponite solid solutions are promoted when the precursors are small particles, whereas large-particle precursors limit their own dissolution and do not yield Mg-Ni saponite solid solutions under the experimental conditions; (ii) because Ni exhibits a greater stability within the saponite structure compared to Mg, the Mg-Ni-saponite solid solutions formed more easily from the mixture of Ni-saponite germs and well-crystallized Mg-saponite precursors than from the mixture of Mg-saponite germs and well-crystallized Ni-saponite precursors; (iii) the dissolution extent (DE) of precursor mixtures increases with longer synthesis time, higher synthesis temperature, and larger gap between synthesis temperature of precursors and of samples, and stabilizes once it reaches a certain value. Thus DE can be used to estimate the kinetics of Mg-Ni saponite crystallization from precursor mixtures. These results obtained from the experimental Mg-Ni saponite system are useful for predicting the evolution processes of smectite in natural systems.

Keywords

clay mineralscrystal growthNiNi-Mg distribution coefficientsaponitesmectitesolid solutionsynthesis
Type
Original Paper
Information
Clays and Clay Minerals , Volume 72 , 2024 , e16
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Clay Minerals Society

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