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    Crystal growth of apatite by replacement of an aragonite precursor

    Access Status
    Fulltext not available
    Authors
    Kasioptas, A.
    Geisler, T.
    Putnis, Christine
    Perdikouri, C.
    Putnis, Andrew
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Kasioptas, A. and Geisler, T. and Putnis, C. and Perdikouri, C. and Putnis, A. 2010. Crystal growth of apatite by replacement of an aragonite precursor. Journal of Crystal Growth. 312 (16-17): pp. 2431-2440.
    Source Title
    Journal of Crystal Growth
    DOI
    10.1016/j.jcrysgro.2010.05.014
    ISSN
    0022-0248
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/7109
    Collection
    • Curtin Research Publications
    Abstract

    The replacement of aragonite by apatite is a process that occurs naturally during diagenesis, chemical weathering and natural hydrothermal reactions and is artificially promoted in medical sciences for use of the product material as a bone implant. We have investigated the mechanism and the kinetics of this replacement by using biogenic aragonite (cuttlebone of the Sepia officinalis) as a starting material and reacting it with di-ammonium hydrogen phosphate solution. Isothermal experiments were carried out over a range of temperatures up to 190 °C. Quantification of each solid phase, for different reaction times, was obtained by the Rietveld analysis of powder X-ray diffraction patterns. An empirical activation energy was calculated by using two different approaches to analyze the data. Scanning electron microscopy showed that the fine structure of the cuttlebone was perfectly retained even after aragonite had been completely converted to apatite. We present a detailed investigation of the kinetics of a reaction that involves interaction of a solid phase with an aqueous fluid and leads to a pseudomorphic replacement of the initial solid phase by a new, chemically different, phase. This replacement process is described in terms of an interface-coupled dissolutionreprecipitation mechanism. © 2010 Elsevier B.V.

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