Type of Publication: | Journal article |
Publication status: | Published |
Author: | Farhadi-Khouzani, Masoud; Chevrier, Daniel M.; Zhang, Peng; Hedin, Niklas; Gebauer, Denis |
Year of publication: | 2016 |
Published in: | Angewandte Chemie International Edition ; 55 (2016), 28. - pp. 8117-8120. - ISSN 1433-7851. - eISSN 1521-3773 |
Pubmed ID: | 27254155 |
DOI (citable link): | https://dx.doi.org/10.1002/anie.201603176 |
Summary: |
Temperature and pH value can affect the short-range order of proto-structured and additive-free amorphous calcium carbonates (ACCs). Whereas a distinct change occurs in proto-vaterite (pv) ACC above 45 °C at pH 9.80, proto-calcite (pc) ACC (pH 8.75) is unaffected within the investigated range of temperatures (7-65 °C). IR and NMR spectroscopic studies together with EXAFS analysis showed that the temperature-induced change is related to the formation of proto-aragonite (pa) ACC. The data strongly suggest that the binding of water molecules induces dipole moments across the carbonate ions in pa-ACC as in aragonite, where the dipole moments are due to the symmetry of the crystal structure. Altogether, a (pseudo-)phase diagram of the CaCO3 polyamorphism in which water plays a key role can be formulated based on variables of state, such as the temperature, and solution parameters, such as the pH value.
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Subject (DDC): | 540 Chemistry |
Bibliography of Konstanz: | Yes |
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FARHADI-KHOUZANI, Masoud, Daniel M. CHEVRIER, Peng ZHANG, Niklas HEDIN, Denis GEBAUER, 2016. Water as the Key to Proto-Aragonite Amorphous CaCO3. In: Angewandte Chemie International Edition. 55(28), pp. 8117-8120. ISSN 1433-7851. eISSN 1521-3773. Available under: doi: 10.1002/anie.201603176
@article{FarhadiKhouzani2016Water-35741, title={Water as the Key to Proto-Aragonite Amorphous CaCO3}, year={2016}, doi={10.1002/anie.201603176}, number={28}, volume={55}, issn={1433-7851}, journal={Angewandte Chemie International Edition}, pages={8117--8120}, author={Farhadi-Khouzani, Masoud and Chevrier, Daniel M. and Zhang, Peng and Hedin, Niklas and Gebauer, Denis} }