Universität zu Köln

Fedoseeva, Yu. V., Okotrub, A. V., Bulusheva, L. G., Maksimovskiy, E. A., Senkovskiy, B. V., Borzdov, Yu. M. and Palyanov, Yu. N. (2016). Insight into effect of water additive on carbon remaining in metal alloys after high-pressure high-temperature diamond synthesis. Diam. Relat. Mat., 70. S. 46 - 52. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 1879-0062

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Abstract

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 degrees 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 sp(2)-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. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fedoseeva, Yu. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Okotrub, A. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bulusheva, L. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maksimovskiy, E. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, B. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borzdov, Yu. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palyanov, Yu. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-256249
DOI:	10.1016/j.diamond.2016.09.023
Journal or Publication Title:	Diam. Relat. Mat.
Volume:	70
Page Range:	S. 46 - 52
Date:	2016
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	1879-0062
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CRYSTAL-GROWTH; IMPURITY; GRAPHITE; H2O Multiple languages Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25624