Инд. авторы:	Fedoseeva Y.V., Okotrub A.V., Bulusheva L.G., Maksimovskiy E.A., Senkovskiy B.V., Borzdov Y.M., Palyanov Y.N.
Заглавие:	Insight into effect of water additive on carbon remaining in metal alloys after high-pressure high-temperature diamond synthesis
Библ. ссылка:	Fedoseeva Y.V., Okotrub A.V., Bulusheva L.G., Maksimovskiy E.A., Senkovskiy B.V., Borzdov Y.M., Palyanov Y.N. Insight into effect of water additive on carbon remaining in metal alloys after high-pressure high-temperature diamond synthesis // Diamond and Related Materials. - 2016. - Vol.70. - P.46-51. - ISSN 0925-9635. - EISSN 1879-0062.
Внешние системы:	DOI: 10.1016/j.diamond.2016.09.023; SCOPUS: 2-s2.0-84989904092; WoS: 000390722400008;
Реферат:	eng: In this study, we attempted to unravel the physicochemical grounds of the effect of water additive on diamond crystallization from a conventional metal-carbon system at high-pressure and high-temperature conditions. The microstructure and chemical state of carbon inclusions remained in a Ni–Fe alloy after the synthesis experiments at 6 GPa and 1370 °C with H2O additive of 0.18 and 0.53 wt% were examined by methods of scanning electron microscopy, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy. It was found, that at the larger H2O concentration, the residual Ni–Fe–C system is enriched by sp2–hybridized carbon and oxygenated carbon, mainly in the carboxyl form. Our results suggest that formation of double bonds between carbon and oxygen atoms terminates tetrahedral hybridization of carbon, which is a necessary condition for nucleation and growth of diamond crystal, and promotes the formation of graphite-like phase. Thus, this study gives insight into the mechanism of diamond nucleation and growth in the presence of water in the metal-carbon melt. © 2016 Elsevier B.V.
Ключевые слова:	High pressure effects; Nickel; Nucleation; High pressure effects in solids; X-ray photoelectrons; Synthesis experiment; Presence of water; Chemical bonds; High pressure high temperature; High Pressure and High Temperature conditions; Diamond nucleation; Conventional metals; X ray absorption near edge structure spectroscopy; X ray absorption fine structure spectroscopy; X ray absorption; Scanning electron microscopy; Pressure effects; Nucleation and growth; Diamonds;
Издано:	2016
Физ. характеристика:	с.46-51