Water as the Key to Proto-Aragonite Amorphous CaCO3

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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} }

Zhang, Peng 2016-10-26T14:02:52Z Chevrier, Daniel M. Gebauer, Denis Hedin, Niklas Farhadi-Khouzani, Masoud Chevrier, Daniel M. 2016 Water as the Key to Proto-Aragonite Amorphous CaCO<sub>3</sub> eng Hedin, Niklas 2016-10-26T14:02:52Z 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. Zhang, Peng Farhadi-Khouzani, Masoud Gebauer, Denis

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