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    Mineral Surface Rearrangement at High Temperatures: Implications for Extraterrestrial Mineral Grain Reactivity.

    Access Status
    Open access via publisher
    Authors
    King, H.
    Plümper, O.
    Putnis, C.
    O'Neill, H.
    Klemme, S.
    Putnis, Andrew
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    King, H. and Plümper, O. and Putnis, C. and O'Neill, H. and Klemme, S. and Putnis, A. 2017. Mineral Surface Rearrangement at High Temperatures: Implications for Extraterrestrial Mineral Grain Reactivity. ACS Earth Space Chem. 1 (2): pp. 113-121.
    Source Title
    ACS Earth Space Chem
    DOI
    10.1021/acsearthspacechem.6b00016
    School
    The Institute for Geoscience Research (TIGeR)
    URI
    http://hdl.handle.net/20.500.11937/53402
    Collection
    • Curtin Research Publications
    Abstract

    Mineral surfaces play a critical role in the solar nebula as a catalytic surface for chemical reactions and potentially acted as a source of water during Earth's accretion by the adsorption of water molecules to the surface of interplanetary dust particles. However, nothing is known about how mineral surfaces respond to short-lived thermal fluctuations that are below the melting temperature of the mineral. Here we show that mineral surfaces react and rearrange within minutes to changes in their local environment despite being far below their melting temperature. Polished surfaces of the rock and planetary dust-forming silicate mineral olivine ((Mg,Fe)2SiO4) show significant surface reorganization textures upon rapid heating resulting in surface features up to 40 nm in height observed after annealing at 1200 °C. Thus, high-temperature fluctuations should provide new and highly reactive sites for chemical reactions on nebula mineral particles. Our results also may help to explain discrepancies between short and long diffusion profiles in experiments where diffusion length scales are of the order of 100 nm or less.

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