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Angew Chem Int Ed Engl. 2017 Dec 18;56(51):16202-16206. doi: 10.1002/anie.201708507. Epub 2017 Nov 23.

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

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Department of Chemistry, National (Taiwan) University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan.
National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.


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.


amorphous calcium carbonate; biomineralization; phospholipids; secondary nucleation; tomography


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