Defect-impurity composition of diamond crystals grown in magnesium-carbon system
DOI:
https://doi.org/10.15587/1729-4061.2015.43402Keywords:
diamond single crystals, magnesium-based system, boron, B-N complexes, uncompensated boron, IR spectroscopyAbstract
In the Mg-C system at p ≤ 8,2 GPa and Т» 1800-2000°C, structurally perfect IIa + IIb type diamond single crystals were obtained, and the peculiarities of their defect-impurity composition were considered. Grown diamonds were studied using IR spectroscopy. As a result of the research, it was found that in this system, it is possible to obtain diamonds with low nitrogen impurity concentration due to limiting its receipt to the crystallization front owing to forming the Mg3N2 nitride at high pressures and temperatures. It was revealed that in the grown diamond crystals, the boron impurity is present in various forms: B-N complexes (D-centers) with a characteristic absorption band at 1290 cm-1 and uncompensated (single) boron (characteristic absorption bands - 2460, 2810 and 2920 cm-1).
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