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Graphitization at diamond dislocation cores

Ewels, CP, Wilson, NT, Heggie, MI, Jones, R and Briddon, PR (2001) Graphitization at diamond dislocation cores Journal of Physics Condensed Matter, 13 (40). pp. 8965-8972.

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We examine possible mechanisms for graphitization at dislocation cores in diamond, both as an explanation for brown coloration in natural brown diamond and as a model for annealing in amorphous carbon materials. We find a metastable structure for the 90° partial dislocation core where bonds are broken in both single- and double-period structures leading to a row of paired sp2 C atoms. We examine the effect of hydrogen and other impurities on this core structure both through direct interaction and potential charging effects. We also investigate a mechanism for progressive aromatization through the migration and aggregation of 30° partial dislocations.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Ewels, CP
Wilson, NT
Jones, R
Briddon, PR
Date : 8 October 2001
DOI : 10.1088/0953-8984/13/40/312
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:42
Last Modified : 24 Jan 2020 22:43

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