Publikation: Water as the Key to Proto-Aragonite Amorphous CaCO3
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2016
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Angewandte Chemie International Edition. 2016, 55(28), pp. 8117-8120. ISSN 1433-7851. eISSN 1521-3773. Available under: doi: 10.1002/anie.201603176
Zusammenfassung
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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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. 2016, 55(28), pp. 8117-8120. ISSN 1433-7851. eISSN 1521-3773. Available under: doi: 10.1002/anie.201603176BibTex
@article{FarhadiKhouzani2016Water-35741,
year={2016},
doi={10.1002/anie.201603176},
title={Water as the Key to Proto-Aragonite Amorphous CaCO<sub>3</sub>},
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}
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<dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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