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Stacking fault and dislocation glide on the basal plane of graphite

Telling, RH and Heggie, MI (2003) Stacking fault and dislocation glide on the basal plane of graphite Philosophical Magazine Letters, 83 (7). pp. 411-421.

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Generalized stacking-fault energies for the basal plane of graphite are calculated from first principles for slip along two high-symmetry directions. The rhombohedral fault energy compares well with experiment and the anisotropy in behaviour is consistent with observed dislocation network geometry. Utilizing these calculated fault energies within a modified Peierls-Nabarro model, we estimate the barrier for basal dislocation motion based on lattice friction. This is found to be extremely small, from which we conclude that dislocation network interaction and pinning, rather than the Peierls barrier, must determine the practical shear strength of graphite. However, at low dislocation densities or over small crystalline regions, the shear strength should tend to this lower limit. We discuss the relevance of this to the mechanism of lubrication.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Telling, RH
Date : 1 July 2003
DOI : 10.1080/0950083031000137839
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:42
Last Modified : 24 Jan 2020 22:43

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