EXPERIMENTAL JUSTIFICATION OF THE INFLUENCE OF S AND Ni ON CRYSTALLIZATION OF LOW-NITROGEN DIAMONDS IN A MELT OF Fe AT HIGH PRESSURE

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Abstract

Based on the analysis of the results on the synthesis and growth of diamonds in metal-sulfide melts at high pressure, the reason for the crystallization of low-nitrogen diamond crystals is substantiated. The introduction of sulfur into the iron melt leads to a decrease in the solubility of nitrogen, which, in turn, leads to a decrease in the content of nitrogen atoms in the melt and the probability of their capture by growing diamond crystals in the form of a structural impurity. The addition of nickel lowers the melting point of the growth system, increases the amount of melt, and, accordingly, promotes the dissociation of molecular nitrogen into individual atoms, which are captured by diamonds during growth as a structural impurity.

About the authors

V. M. Sonin

Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: ezhimulev@igm.nsc.ru
Russian Federation, Novosibirsk

E. I. Zhimulev

Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: ezhimulev@igm.nsc.ru
Russian Federation, Novosibirsk

A. A. Chepurov

Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: ezhimulev@igm.nsc.ru
Russian Federation, Novosibirsk

A. A. Tomilenko

Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: ezhimulev@igm.nsc.ru
Russian Federation, Novosibirsk

A. I. Chepurov

Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: ezhimulev@igm.nsc.ru
Russian Federation, Novosibirsk

N. P. Pokhilenko

Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: ezhimulev@igm.nsc.ru
Russian Federation, Novosibirsk

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Copyright (c) 2023 В.М. Сонин, Е.И. Жимулев, А.А. Чепуров, А.А. Томиленко, А.И. Чепуров, Н.П. Похиленко

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