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    Evolution of Threshold Displacement Energy in Irradiated Graphite

    Access Status
    Fulltext not available
    Authors
    Vukovic, F.
    Leyssale, J.
    Aurel, P.
    Marks, Nigel
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Vukovic, F. and Leyssale, J. and Aurel, P. and Marks, N. 2018. Evolution of Threshold Displacement Energy in Irradiated Graphite. Physical Review Applied. 10 (6): Article ID 064040.
    Source Title
    Physical Review Applied
    DOI
    10.1103/PhysRevApplied.10.064040
    ISSN
    2331-7019
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/74332
    Collection
    • Curtin Research Publications
    Abstract

    Molecular-dynamics simulations are used to compute the threshold displacement energy (Ed) in a series of progressively damaged graphite structures. The Ed values are obtained by a statistically robust probabilistic method using a large number of primary-knock-on-atom events at energies up to 100 eV. No sharp threshold for Ed is observed, and a number of possible definitions are considered. For pristine graphite, the best estimate of Ed is 24 eV. Ed decreases with increasing irradiation damage, dropping by nearly a factor of 2 at a dose of one displacement per atom. For a fully disordered amorphous-carbon structure, Ed is around 5 eV. This evolution of Ed is an important missing ingredient in current estimates of radiation doses in nuclear reactors, which assume Ed is constant over the reactor lifetime, despite substantial structural evolution.

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