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Wigner defects bridge the graphite gap.

Telling, RH, Ewels, CP, El-Barbary, AA and Heggie, MI (2003) Wigner defects bridge the graphite gap. Nat Mater, 2 (5). pp. 333-337.

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We present findings on the structure, energies and behaviour of defects in irradiated graphitic carbon materials. Defect production due to high-energy nuclear radiations experienced in graphite moderators is generally associated with undesirable changes in internal energy, microstructure and physical properties--the so-called Wigner effect. On the flip side, the controlled introduction and ability to handle such defects in the electron beam is considered a desirable way to engineer the properties of carbon nanostructures. In both cases, the atomic-level details of structure and interaction are only just beginning to be understood. Here, using a model system of crystalline graphite, we show from first-principles calculations, new details in the behaviour of vacancy and interstitial defects. We identify a prominent barrier-state to energy release, reveal a surprising ability of vacancy defects to bridge the widely spaced atomic layers, and discuss physical property and microstructure changes during irradiation, including interactions with dislocations.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Telling, RH
Ewels, CP
El-Barbary, AA
Date : May 2003
DOI : 10.1038/nmat876
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:42
Last Modified : 24 Jan 2020 22:42

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