Lookup NU author(s): Dr Jon Goss
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It has long been understood that nitrogen in diamond energetically favours aggregated forms as a consequence of the reduction in the number of dangling bonds. Thus heating to around 1500 degrees C leads to the formation of A-centres, which are close-by pairs of substitutional N atoms. However, the mechanism by which N moves through the diamond lattice to form the aggregates is much less clear, although for some time it has been generally thought that it may be mediated by lattice vacancies. In this study, we review the energetics of this mechanism in comparison to one based upon self-interstitials, and show that the available experimental evidence is much more consistent with an interstitial mechanism than one based upon lattice vacancies. (C) 2015 Elsevier B.V. All rights reserved.
Author(s): Jones R, Goss JP, Pinto H, Palmer DW
Publication type: Article
Publication status: Published
Journal: Diamond and Related Materials
Print publication date: 01/03/2015
Online publication date: 21/01/2015
Acceptance date: 07/01/2015
ISSN (print): 0925-9635
ISSN (electronic): 1879-0062
Publisher: Elsevier Science SA
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