High‐Magnesium Calcite Mesocrystals: Formation in Aqueous Solution under Ambient Conditions

Mesocrystals of high‐magnesian calcites are commonly found in biogenic calcites. Under ambient conditions, it remains challenging to prepare mesocrystals of high‐magnesian calcite in aqueous solution. We report that mesocrystals of calcite with magnesium content of about 20 mol % can be obtained fro...

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Bibliographic Details
Published in:Angewandte Chemie 2017-12, Vol.129 (51), p.16420-16424
Main Authors: Yu, Pao‐Tao, Tsao, Chieh, Wang, Chun‐Chieh, Chang, Chun‐Yu, Wang, Chia‐Hsin, Chan, Jerry Chun Chung
Format: Article
Language:English
Subjects:
Amorphes Calciumcarbonat
Aqueous solutions
Biomineralisierung
Calcite
Calcium
Calcium carbonate
Chemistry
Diffraction patterns
Electron diffraction
Image transmission
Magnesium
Microspheres
Moisture content
Phase transitions
Phospholipide
Sekundäre Keimbildung
Solid state
Tomographie
Water content
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Summary:Mesocrystals of high‐magnesian calcites are commonly found in biogenic calcites. Under ambient conditions, it remains challenging to prepare mesocrystals of high‐magnesian calcite in aqueous solution. We report that mesocrystals of calcite with magnesium content of about 20 mol % can be obtained from the phase transformation of magnesian amorphous calcium carbonate (Mg‐ACC) in lipid solution. The limited water content on the Mg‐ACC surface would reduce the extent of the dissolution–reprecipitation process and bias the phase transformation pathway toward solid‐state reaction. We infer from the selected area electron diffraction patterns and the dark‐field transmission electron microscopic images that the formation of Mg‐calcite mesocrystals occurs through solid‐state secondary nucleation, for which the phase transformation is initiated near the mineral surface and the crystalline phase propagates gradually toward the interior part of the microspheres of Mg‐ACC. Mesokristalle von Calcit mit hohem Mg‐Gehalt wurden in wässriger Lösung unter Verwendung von Phospholipid‐Additiven hergestellt. Die Dunkelfeldbilder mit dem Ursprung im (104)‐Beugungspunkt legen nahe, dass zahlreiche Mg‐Calcit‐Nanokristallite die gleiche Orientierung haben.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201708507