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    Low-temperature crystallization of MgSiO3 glasses under electron irradiation: Possible implications for silicate dust evolution in circumstellar environments

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    Author
    Carrez, Philippe
    Demyk, Karine
    Leroux, Hugues
    Cordier, Patrick
    Jones, Anthony P.
    D'Hendecourt, Louis
    Issue Date
    2002-01-01
    Keywords
    TEM
    crystal
    MgSiO3 glasses
    irradiated
    electrons
    crystallization
    
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    Citation
    Carrez, P., Demyk, K., Leroux, H., Cordier, P., Jones, A. P., & D'Hendecourt, L. (2002). Low‐temperature crystallization of MgSiO3 glasses under electron irradiation: Possible implications for silicate dust evolution in circumstellar environments. Meteoritics & Planetary Science, 37(11), 1615-1622.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655591
    DOI
    10.1111/j.1945-5100.2002.tb00815.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Synthetic MgSiO3 glasses were irradiated at room temperature by 300 keV electrons in a transmission electron microscope. One of the samples had been previously irradiated by 50 keV He+ ions. Electron irradiation induces the nucleation and growth of randomly oriented nanometer-sized crystallites. The crystallites first consist of MgO and subsequently of forsterite (Mg2SiO4). Both are seen to form within an amorphous SiO2 matrix. The rate of crystallisation of the samples has been monitored by conventional TEM imaging and electron diffraction. The sample that had been pre-irradiated with He+ ions is found to transform faster than the as-quenched glass. The crystallization of metastable MgSiO3 glasses is explained by ionising radiation-induced elemental diffusion which allows the reorganization of matter into a more favourable thermodynamic state. These results show that ionizing radiation interactions could account for crystal formation as observed in IR spectroscopy in some young stellar environments.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2002.tb00815.x
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    Meteoritics & Planetary Science, Volume 37, Number 11 (2002)

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