Инд. авторы:	Palyanov Y.N., Borzdov Y.M., Kupriyanov I.N., Bataleva Y.V., Nechaev D.V.
Заглавие:	Effect of Oxygen on Diamond Crystallization in Metal-Carbon Systems
Библ. ссылка:	Palyanov Y.N., Borzdov Y.M., Kupriyanov I.N., Bataleva Y.V., Nechaev D.V. Effect of Oxygen on Diamond Crystallization in Metal-Carbon Systems // ACS OMEGA. - 2020. - Vol.5. - Iss. 29. - P.18376-18383. - ISSN 2470-1343.
Внешние системы:	DOI: 10.1021/acsomega.0c02130; РИНЦ: 45436395; PubMed: 32743213; WoS: 000557750100059;
Реферат:	eng: In this article, we report the influence of oxygen concentration in the transition-metal solvent-catalyst on the crystallization processes, morphology, and defect-and-impurity content of diamond crystals. In a series of experiments, the concentration of oxygen (C-o) in the growth system was varied by adding Fe2O3 to the charge, and the other parameters and conditions of the growth were constant: Ni7Fe3 solvent-catalyst, P = 6.0 GPa, T = 1400 degrees C, and duration of 40 h. It is found that on increasing C-o in the growth system from 0 to 10 wt %, the crystallization of diamond proceeds through the following stages: single crystal -> block crystal -> spontaneous crystals -> aggregate of block crystals and twin crystals. At C-o >= S wt %, diamond crystallizes jointly with wustite (FeO) and metastable graphite. The oxygen solubility in the iron-nickel melt is estimated at about 2 wt %. With increasing oxygen content in the system, the range of nitrogen concentrations in diamonds crystallized in one experiment significantly broadens with the maximum nitrogen concentrations being increased from 200-250 ppm in the experiment without O additives to 1100-1200 ppm in the experiment with 10 wt % O added. The established joint growth of diamond and wustite suggests possible crystallization of natural diamonds in the Fe-Ni-O-C system over a wide range of oxygen concentrations up to 10 wt %.
Ключевые слова:	FUGACITY; IRON; NITROGEN; DEEP MANTLE; INFRARED-ABSORPTION; LOWER-MANTLE; CRYSTAL-GROWTH; MINERAL INCLUSIONS; OXIDATION-STATE; HYDROGEN;
Издано:	2020
Физ. характеристика:	с.18376-18383
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