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    He migration and bubble formation in Ga stabilised delta-Pu

    Access Status
    Open access via publisher
    Authors
    Robinson, Marc
    Kenny, S.
    Smith, R.
    Storr, M.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Robinson, M. and Kenny, S. and Smith, R. and Storr, M. 2014. He migration and bubble formation in Ga stabilised delta-Pu. Journal of Nuclear Materials. 444 (1-3): pp. 493-500.
    Source Title
    Journal of Nuclear Materials
    DOI
    10.1016/j.jnucmat.2013.10.017
    ISSN
    0022-3115
    URI
    http://hdl.handle.net/20.500.11937/25676
    Collection
    • Curtin Research Publications
    Abstract

    The migration and formation of He into bubbles in Ga stabilised δ-Pu has been investigated using molecular dynamics simulation. Formation energy calculations indicate that isolated He interstitial atoms are unfavourable and that it is preferential for He to reside as a substitutional atom at the expense of producing a Pu self-interstitial. Migration energy barrier calculations and on-the-fly kinetic Monte Carlo simulations support this result establishing that an interstitial He atom soon becomes substitutional, after which migration is unlikely unless assisted by local vacancies. He-vacancy cluster formation energies show that as the void size increases, a He:vacancy ratio up to 2:1 becomes energetically favourable over isolated He substitutional atoms and vacancies.

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