Effect of annealing at high pressures and temperatures on the defect-admixture structure of natural diamonds
- 1 October 2010
- journal article
- Published by Pleiades Publishing Ltd in Inorganic Materials: Applied Research
- Vol. 1 (4), 303-310
- https://doi.org/10.1134/s2075113310040076
Abstract
The changes in the set and concentration of optically active defects in brown natural diamonds subjected to high pressure and high temperature annealing are studied. The darker brown color of the studied samples corresponds to stronger plastic deformation. The activation energy of the dissociation of the nitrogen pairs (defects A) decreases from 6.0 ± 0.4 eV in colorless samples with weak plastic deformation to 3.7 eV in dark brown samples with strong deformation. Possible defect transformation mechanisms are discussed.Keywords
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