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He migration and bubble formation in Ga stabilised delta-Pu

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posted on 2014-12-17, 14:04 authored by Marc Robinson, Steven KennySteven Kenny, Roger Smith, M.T. Storr
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.

Funding

This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) and the AWE.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

JOURNAL OF NUCLEAR MATERIALS

Volume

444

Issue

1-3

Pages

493 - 500 (8)

Citation

ROBINSON, M. ... et al., 2014. He migration and bubble formation in Ga stabilised delta-Pu. Journal of Nuclear Materials, 444 (1-3), pp. 493 - 500.

Publisher

© The Authors. Published by Elsevier B.V.

Version

  • VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

ISSN

0022-3115

Language

  • en

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