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

Heggie, Malcolm (2011) Buckle, ruck and tuck: a proposed new model for the response of graphite to neutron irradiation. Journal of Nuclear Materials, 413. pp. 150-155. ISSN 00223115

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Abstract

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.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Malcolm Heggie
Date Deposited: 06 Feb 2012 18:49
Last Modified: 31 May 2012 14:49
URI: http://srodev.sussex.ac.uk/id/eprint/18483
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