High-temperature annealing of optical centers in type-I diamond
| Autor: | Alex Connor, Abdulla Shareef, Cheng-Han Ly, Alan T. Collins, Paul M. Spear |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 97:083517 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.1866501 |
| Popis: | Diamonds previously subjected to radiation damage have been annealed at temperatures up to 1750°C at ambient pressure, and at 2300°C using a stabilizing pressure of 5GPa. The results have been compared with those from similar measurements using natural brown diamonds. The investigation has led to an improved understanding of the commercial process for enhancing the color of brown diamonds by high-pressure, high-temperature (HPHT) annealing. The study has confirmed that the H4 center is less stable than the H3 center, and shown that the destruction of the H4 center in irradiated type-IaB diamonds coincides with the formation of a number of optical centers found to occur naturally in brown diamonds. In type-IaA diamonds the annealing out of the H1b absorption coincides with the production of H2 centers. Annealing measurements on brown diamonds indicate that the plastic deformation, associated with the brown color, occurred at a late stage in the diamonds’ history. Optical centers, such as H3 and (NV)−, tha... |
| Databáze: | OpenAIRE |
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