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dc.contributor.authorFarhadi-Khouzani, M.
dc.contributor.authorChevrier, D.
dc.contributor.authorZhang, P.
dc.contributor.authorHedin, N.
dc.contributor.authorGebauer, Denis
dc.identifier.citationFarhadi-Khouzani, M. and Chevrier, D. and Zhang, P. and Hedin, N. and Gebauer, D. 2016. Water as the Key to Proto-Aragonite Amorphous CaCO<inf>3</inf>. Angewandte Chemie - International Edition. 55 (28): pp. 8117-8120.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimTemperature 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.

dc.publisherWiley-VCH Verlag
dc.titleWater as the Key to Proto-Aragonite Amorphous CaCO<inf>3</inf>
dc.typeJournal Article
dcterms.source.titleAngewandte Chemie - International Edition
curtin.departmentDepartment of Chemistry
curtin.accessStatusFulltext not available

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