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    An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals

    127966_127966CRYS18458richmond.pdf (710.3Kb)
    Access Status
    Open access
    Authors
    Hockridge, James
    Jones, Franca
    Loan, M.
    Richmond, William
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hockridge, James and Jones, Franca and Loan, Mitch and Richmond, William. 2009. An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals. Journal of Crystal Growth 311: pp. 3876-3882.
    Source Title
    Journal of Crystal Growth
    DOI
    10.1016/j.jcrysgro.2009.06.023
    ISSN
    00220248
    Faculty
    Nanochemistry Research Institute (NRI)
    Faculty of Science and Engineering
    School
    Nanochemistry Research Institute (Research Institute)
    Remarks

    The link to the journal’s home page is: www.elsevier.com/locate/jcrysgro

    Copyright © 2008 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/47300
    Collection
    • Curtin Research Publications
    Abstract

    The formation of their onoxyhydroxide schwertmannite has been monitored by time-resolved transmission electronmicroscopy (TEM) studies. Schwertmannitea ggregates are found to form initially as spherical agglomerates offer rihydrite crystallites, which then begin to grow characteristic needles on their surfaces. High-resolution images of the needles show that they are initially comprised of aligned goethite nanocrystals, which subsequently coarsen to form crystallographically coherent needles of goethite. Thus, needle formation on schwertmannite aggregates can be considered as the first stage in the phase transformation from schwertmannite to goethite. The results of this study suggest that schwertmannite is not a distinct mineral phase, but may be a mixture of ferrihydrite and poorly crystalline goethite with a distinctive morphology directed by the presence of surface-adsorbed sulfate anions.

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