Lookup NU author(s): Professor Patrick Briddon
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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.
Author(s): Ewels CP, Wilson NT, Heggie MI, Jones R, Briddon PR
Publication type: Article
Publication status: Published
Journal: Journal of Physics Condensed Matter
ISSN (print): 0953-8984
ISSN (electronic): 1361-648X
Publisher: Institute of Physics Publishing Ltd.
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