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Buckle, ruck and tuck: a proposed new model for the response of graphite to neutron irradiation

journal contribution
posted on 2023-06-07, 21:28 authored by Malcolm Heggie
The default theory of radiation damage in graphite invokes Frenkel pair formation as the principal cause of physical property changes. We set out its inadequacies and present two new mechanisms that contribute to a better account for changes in dimension and stored energy. Damage depends on the substrate temperature, undergoing a change at approximately 250oC. Below this temperature particle radiation imparts a permanent, nano-buckling to the layers. Above it, layers fold, forming what we describe as a ruck and tuck defect. We present first principles and molecular mechanics calculations of energies and structures to support these claims. Necessarily we extend the dislocation theory of layered materials. We cite good experimental evidence for these features from the literature on radiation damage in graphite.

History

Publication status

  • Published

Journal

Journal of Nuclear Materials

ISSN

00223115

Publisher

Elsevier

Volume

413

Page range

150-155

Department affiliated with

  • Chemistry Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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