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    Nonequilibrium Route to Nanodiamond with Astrophysical Implications

    Access Status
    Fulltext not available
    Authors
    Marks, Nigel
    Lattemann, M.
    McKenzie, D.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Marks, N.A. and Lattemann, M. and McKenzie, D.R. 2012. Nonequilibrium Route to Nanodiamond with Astrophysical Implications. Physical Review Letters. 108: 075503.
    Source Title
    Physical Review Letters
    DOI
    10.1103/PhysRevLett.108.075503
    ISSN
    0031-9007
    URI
    http://hdl.handle.net/20.500.11937/39826
    Collection
    • Curtin Research Publications
    Abstract

    Nanometer-sized diamond grains are commonly found in primitive chondritic meteorites, but their origin is puzzling. Using evidence from atomistic simulation, we establish a mechanism by which nanodiamonds form abundantly in space in a two-stage process involving condensation of vapor to form carbon onions followed by transformation to nanodiamond in an energetic impact. This nonequilibrium process is consistent with common environments in space and invokes the fewest assumptions of any proposed model. Accordingly, our model can explain nanodiamond formation in both presolar and solar environments. The model provides an attractive framework for understanding noble gas incorporation and explains all key features of meteoritic nanodiamond, including size, shape, and polytype. By understanding the creation of nanodiamonds, new opportunities arise for their exploitation as a powerful astrophysical probe.

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