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Fritsch, E., Massi, L., Rossman, G. R., Hainschwang, T., Jobic, S. & Dessapt, R. (2007) Thermochromic and photochromic behaviour of "chameleon" diamonds. Diam. Relat. Mat. 16 401–408.
Added by: Laurent Cournède (2016-03-10 22:02:31) |
| Type de référence: Article DOI: 10.1016/j.diamond.2006.08.014 Numéro d'identification (ISBN etc.): 0925-9635 Clé BibTeX: Fritsch2007a Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: absorption-spectra, chameleon effect, Defects, high-pressure, hydrogen, Natural diamond, Natural diamonds, Nickel, optical properties, synthetic diamond Créateurs: Dessapt, Fritsch, Hainschwang, Jobic, Massi, Rossman Collection: Diam. Relat. Mat. |
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Chameleon diamonds typically change color from greyish-green to yellow when they are heated or cooled (thermochrornic behaviour) or kept in the dark (photochromic behaviour). Those diamonds are type la with A aggregates largely dominating the nitrogen speciation. They contain moderate to high amounts of hydrogen, in addition to some isolated nitrogen and traces of nickel. Their UV Visible spectrum comprises the continuum typical of type Ib material, the 480 am band and a broad band centred around 800 run. It is mainly modified in the red part of the visible spectrum when the color change occurs. We here propose an electronic model consistent with all observed color behaviours, based on the premise that yellow is the stable color whereas green is the metastable one. The chameleon effect is possibly linked to a nitrogen-hydrogen complex. (c) 2006 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |