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Origin of brown coloration in diamond

Lookup NU author(s): Dr Michael Shaw, Professor Patrick Briddon

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Abstract

Measurements of the absorption spectra of brown natural type IIa diamond as well as brown nitrogen-doped CVD diamond are reported. These are largely featureless and increase almost monotonically from about 1- 5.5 eV. It is argued that the brown coloration is due to an extended defect and not to a point defect. First principles modeling studies demonstrate that the spectra could be attributed to vacancy disks lying on {111} planes. Such disks are unstable above about 200 vacancies and should relax to dislocation loops in natural diamond. Hydrogen is shown to passivate the optical activity of the disks. © 2006 The American Physical Society.


Publication metadata

Author(s): Hounsome LS, Jones R, Martineau PM, Fisher D, Shaw MJ, Briddon PR, Oberg S

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2006

Volume: 73

Issue: 12

ISSN (print): 1098-0121

ISSN (electronic): 1550-235X

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevB.73.125203

DOI: 10.1103/PhysRevB.73.125203

Notes: Article no. 125203 8 pages


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