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Small ionic radius limits magnesium water interaction in amorphous calcium/magnesium carbonates

DOI: 10.1021/acs.jpcc.9b11594 DOI Help

Authors: Anders C. S. Jensen (Max Planck Institute of Colloids and Interfaces; Queen Mary University of London; Imperial College London) , Silvia Imberti (ISIS Pulsed Neutron and Muon Source) , Wouter J. E. M. Habraken (Max Planck Institute of Colloids and Interfaces) , Luca Bertinetti (Max Planck Institute of Colloids and Interfaces)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: February 2020
Diamond Proposal Number(s): 15157

Abstract: The stabilizing effect of magnesium ions on amorphous calcium carbonate has been studied extensively due to its wide spread occurrence in biogenic minerals. It has long been suggested that magnesium binds water more strongly compared to calcium given its relatively high dehydration energy. However, recent work has shown that mobility increases in the presence of magnesium ion relative to the pure calcium phase. Using total scattering and EPSR modelling, we show here that in amorphous magnesium carbonate, because of the small size of the ion, the coordination number of magnesium is smaller and the interaction with water are therefore limited. As a result, ~35% of water molecules are bound exclusively by hydrogen bonds mainly to the anions.

Subject Areas: Chemistry


Instruments: I15-Extreme Conditions

Other Facilities: ISIS

Added On: 02/03/2020 11:02

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Physical Chemistry Chemistry

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