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Graphitization at diamond dislocation cores

Lookup NU author(s): Professor Patrick Briddon

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Abstract

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.

Publication metadata

Author(s): Ewels CP, Wilson NT, Heggie MI, Jones R, Briddon PR

Publication type: Article

Publication status: Published

Journal: Journal of Physics Condensed Matter

Year: 2001

Volume: 13

Issue: 40

Pages: 8965-8972

ISSN (print): 0953-8984

ISSN (electronic): 1361-648X

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-8984/13/40/312

DOI: 10.1088/0953-8984/13/40/312

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