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    Strain-induced segmentation of magnesian calcite thin films growing on a calcite substrate

    Access Status
    Fulltext not available
    Authors
    Sethmann, I.
    Wang, J.
    Becker, U.
    Putnis, Andrew
    Date
    2010
    Type
    Conference Paper
    
    Metadata
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    Citation
    Sethmann, I. and Wang, J. and Becker, U. and Putnis, A. 2010. Strain-induced segmentation of magnesian calcite thin films growing on a calcite substrate, pp. 4319-4326.
    Source Title
    Crystal Growth and Design
    DOI
    10.1021/cg100202h
    ISSN
    1528-7483
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/12456
    Collection
    • Curtin Research Publications
    Abstract

    In crystal growth of mineral species or different compositional members of a solid solution on one another, the degree of lattice mismatch at their interface affects the growth pattern of the precipitating mineral phase. Fast layer-by-layer growth of magnesian calcite on pure calcite (1014) substrates has been observed at Mg2+/Ca2+ ratios of 2-7 using in situ atomic force microscopy. Under solution conditions of calcite saturation states starting from ˜ 33, depending on Mg2+/Ca2+ ratios and carbonate content, bulging in the epitaxial magnesian calcite thin film led to the formation of networks of ridges along the [441], [481], and [421] directions. Eventually, spreading of monolayers stopped at the ridges and formed stationary multilayer steps, resulting in separate and individually growing crystal segments. Molecular dynamics computational modeling suggests that relaxation of strain energy, caused by the interfacial lattice mismatch between pure calcite and the isostructural magnesium-containing phase with smaller lattice constants, leads to a semicoherent interface and disordered linear zones cutting through the thin film. As a consequence, the surface bulges up in a way similar to our laboratory observations. This strain-induced segmentation produces aggregates of aligned microcrystals and increase knowledge of the behavior of strained thin films in general. © 2010 American Chemical Society.

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