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    Simulating radiation damage cascades in graphite

    231399_231399.pdf (1.217Mb)
    Access Status
    Open access
    Authors
    Christie, H.
    Robinson, M.
    Roach, D.
    Ross, D.
    Suarez-Martinez, I.
    Marks, Nigel
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Christie, H. and Robinson, M. and Roach, D. and Ross, D. and Suarez-Martinez, I. and Marks, N. 2015. Simulating radiation damage cascades in graphite. Carbon. 81 (1): pp. 105-114.
    Source Title
    Carbon
    DOI
    10.1016/j.carbon.2014.09.031
    ISSN
    0008-6223
    School
    Department of Physics and Astronomy
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by/3.0/

    URI
    http://hdl.handle.net/20.500.11937/8429
    Collection
    • Curtin Research Publications
    Abstract

    Molecular dynamics simulation is used to study radiation damage cascades in graphite. High statistical precision is obtained by sampling a wide energy range (100-2500 eV) and a large number of initial directions of the primary knock-on atom. Chemical bonding is described using the Environment Dependent Interaction Potential for carbon. Graphite is found to exhibit a radiation response distinct from metals and oxides primarily due to the absence of a thermal spike which results in point defects and disconnected regions of damage. Other unique attributes include exceedingly short cascade lifetimes and fractal like atomic trajectories. Unusually for a solid, the binary collision approximation is useful across a wide energy range, and as a consequence residual damage is consistent with the Kinchin-Pease model. The simulations are in agreement with known experimental data and help to clarify substantial uncertainty in the literature regarding the extent of the cascade and the associated damage.

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