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Electron energy loss spectroscopic studies of brown diamonds
School of Physics, University of Exeter.
Lunar & Planetary Lab., Arizona University, Tucson.
School of Physics, University of Exeter.
School of Physics, University of Exeter.
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2006 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 86, no 29-31, p. 4757-4779Article in journal (Refereed) Published
Abstract [en]

We investigate both experimentally and theoretically, low-loss electron energy losses in brown type IIa monocrystalline diamonds both before and after high-temperature, high-pressure anneals which remove the brown colouration. We find additional losses within and near the band edge for brown diamond which are significantly reduced after treatment. The additional losses are not associated with dislocations. Graphitic inclusions are detected by EELS as well as TEM studies for some brown diamonds before treatment. These lead to pronounced subgap absorption. However, all brown diamonds exhibit additional losses which are due to point defects lying in the regions between dislocations. First principles theoretical modelling shows that common dislocations are not responsible for the brown colouration but a -bonded vacancy disk lying on {111} planes gives broad bands lying in the diamond band gap, possesses an optical absorption spectrum similar to that of brown diamond, and leads to additional electron energy losses in the band edge region. These and similar defects are suggested to be responsible for the brown colouration. Mechanisms are proposed for their formation and removal.

Place, publisher, year, edition, pages
2006. Vol. 86, no 29-31, p. 4757-4779
National Category
Computational Mathematics
Research subject
Scientific Computing
Identifiers
URN: urn:nbn:se:ltu:diva-10395Local ID: 9332a2c0-bc01-11db-a46c-000ea68e967bOAI: oai:DiVA.org:ltu-10395DiVA, id: diva2:983340
Note
Validerad; 2006; 20070214 (kani)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Öberg, Sven

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