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    Stabilization of Aragonite: Role of Mg2+ and Other Impurity Ions

    81019.pdf (2.001Mb)
    Access Status
    Open access
    Authors
    Boon, Matthew
    Rickard, William
    Rohl, Andrew
    Jones, Franca
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Boon, M. and Rickard, W.D.A. and Rohl, A.L. and Jones, F. 2020. Stabilization of Aragonite: Role of Mg2+ and Other Impurity Ions. Crystal Growth and Design. 20 (8): pp. 5006-5017.
    Source Title
    Crystal Growth and Design
    DOI
    10.1021/acs.cgd.0c00152
    ISSN
    1528-7483
    Faculty
    Faculty of Science and Engineering
    School
    John de Laeter Centre (JdLC)
    School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
    School of Molecular and Life Sciences (MLS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE0775551
    http://purl.org/au-research/grants/arc/LE130100053
    http://purl.org/au-research/grants/arc/LE140100150
    Remarks

    This document is the Accepted Manuscript version of a Published Work that appeared in final form in Crystal Growth & Design, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acs.cgd.0c00152.

    URI
    http://hdl.handle.net/20.500.11937/80957
    Collection
    • Curtin Research Publications
    Abstract

    Copyright © 2020 American Chemical Society. Aragonite formation and stabilization in seawater is still an area of active investigation since the thermodynamically stable product at room temperature is calcite. In this manuscript, purely inorganic systems that were found to stabilize aragonite were analyzed by various techniques. Dynamic light scattering was used to characterize the nucleation behavior of the system, and it was found that the presence of magnesium ions during crystal formation inhibits nucleation overall, not just calcite nucleation. In addition, it was found that sulfate is not necessary to stabilize aragonite. Microanalysis by energy dispersive X-ray spectroscopy and electron backscatter diffraction revealed that the aragonite that was formed had a disordered core with sodium, magnesium, and sulfate ions incorporated into the structure. To the best of the authors' knowledge this is the first time an amorphous calcium carbonate (ACC) core in aragonite has been visualized in a completely abiotic, synthetic system (i.e., in the absence of organic molecules). Inclusion of these impurities into the structure may explain the stability of aragonite in natural seawaters.

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