Effect of sulfur concentration on diamond crystallization in the Fe–C–S system at 5.3–5.5 GPa and 1300–1370°C

Жимулев, Е. И.; Сонин, В. М.; Mironov, Andrey E.; Chepurov, A. I.

doi:10.1134/s0016702916050116

Cited by 24 publications

(11 citation statements)

References 34 publications

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“…Cooling in this system leads to crystallization of cohenite (Fe 3 C), FeS, and a γ phase (solid solution of carbon in iron). Iron carbide Fe 7 C 3 appears at a pressure exceeding 5 GPa (Dasgupta et al, 2009;Zhimulev et al, 2016a).…”

Section: Discussionmentioning

confidence: 99%

“…The experiments were conducted on a pressless splitsphere multi-anvil apparatus (BARS) at a pressure of 4 GPa, and a temperature of 1400°C, with a run duration of 1 h. The design of the BARS apparatus and the methods of pressure and temperature determination were detailed in (Chepurov et al, 1998;Zhimulev et al, 2016a). The solid-phase high-pressure cell was made of ZrO 2 , CaO, and MgO refractory oxides and had a cylindrical graphite heater with molybdenum current conductors in its center (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Dissolution of diamond crystals in a heterogeneous (metal–sulfide–silicate) medium at 4 GPa and 1400 °C

Сонин

Жимулев

Чепуров

et al. 2018

Journal of Mineralogical and Petrological Sciences

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As a result of artificial dissolution of diamonds at 4 GPa and 1400°C in a heterogeneous solvent (Fe-S melt with the addition of natural kimberlite in an amount of 5 wt%), it is established that, in the dissolution process the diamond crystals of octahedron form with flat faces and sharp edges are transformed into rounded octahedroids. The role of silicate additives is to local screen the surface of diamonds with the formation of etch hillocks, which gives crystals a visually complex external morphology. Thus morphologically complex natural diamonds with irregular shapes may form by dissolution by heterogeneous solvents in the mantle. Metal-sulfide-silicate melts consisting of immiscible components with different carbon solubility are the most likely candidates for such solvents.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dissolution of diamond crystals in a heterogeneous (metal–sulfide–silicate) medium at 4 GPa and 1400 °C

Сонин

Жимулев

Чепуров

et al. 2018

Journal of Mineralogical and Petrological Sciences

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“…A PtRh (30/6) thermocouple was placed in the CHP close to the sample in order to measure the temperature. The accuracy of the temperature measurements was AE2 K, but the accuracy in determining the temperature at the centre of the reaction volume in the experiments was AE25 K. The temperature Zhimulev et al (2016) gradient in the CHP was 15 K mm À1 . The temperature was increased to a given value at a rate of 200 K min À1 .…”

Section: Methodsmentioning

confidence: 98%

“…According to Dasgupta et al (2009), Fe 7 C 3 carbide is observed after experiments at 6 GPa and 1573 K. The authors concluded that an increase in the amount of sulfur in the system decreases the reaction temperature of the reaction melt + diamond = Fe 7 C 3 . In the study by Zhimulev et al (2016), Fe 7 C 3 carbide was synthesized in the temperature interval of 1573-1623 K and at pressures of 5.3-5.5 GPa. It was also shown that sulfur-containing systems based on an iron melt are diamond producing at low sulfur content (Zhimulev et al, 2012(Zhimulev et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

Formation of two crystal modifications of Fe₇C_3−x at 5.5 GPa

et al. 2019

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The Fe–C system, which is widely used to grow commercial high‐pressure–high‐temperature diamond monocrystals, is rather complicated due to the formation of carbides. The carbide Fe3C is a normal run product, but the pressure at which Fe7C3 carbide becomes stable is a subject of discussion. This paper demonstrates the synthesis of Fe7C3 carbide and its detailed study using single‐crystal and powder X‐ray diffraction, as well as electron probe micro‐analysis and scanning electron microscopy. The experiments were performed using a multiple‐anvil high‐pressure apparatus of `split‐sphere' (BARS) type at a pressure of 5.5 GPa and a temperature of 1623 K. Our results show that in the Fe–C system, in addition to diamond, a phase that corresponds to the Fe7C3 carbide was synthesized. This means that both carbides (Fe7C3 and Fe3C) are stable at 5.5 GPa. Two crystal phases are described, Fe14C6 and Fe28C12−x. Fe14C6 is based on the well known rhombic structure of Fe7C3, while Fe28C12−x has a different packing order of Fe6C polyhedrons. The results obtained in this study should be taken into account when synthesizing and growing diamond at high pressures and temperatures in metal–carbon systems with a high iron content, as well as when conducting experimental studies on the synthesis of diamond directly from carbide.

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“…The chemical composition of the sulfide corresponds to that of pyrrhotite. 29 Fig. 1 The assembly of the high-pressure cell used to grow diamond crystals at the top of the reaction chamber.…”

Section: As-grown Diamond Crystalsmentioning

confidence: 99%

Characterization of the nitrogen state in HPHT diamonds grown in an Fe–C melt with a low sulfur addition

et al. 2022

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Effect of sulfur concentration on diamond crystallization in the Fe–C–S system at 5.3–5.5 GPa and 1300–1370°C

Cited by 24 publications

References 34 publications

Dissolution of diamond crystals in a heterogeneous (metal–sulfide–silicate) medium at 4 GPa and 1400 °C

Dissolution of diamond crystals in a heterogeneous (metal–sulfide–silicate) medium at 4 GPa and 1400 °C

Formation of two crystal modifications of Fe₇C_3−x at 5.5 GPa

Characterization of the nitrogen state in HPHT diamonds grown in an Fe–C melt with a low sulfur addition

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Effect of sulfur concentration on diamond crystallization in the Fe–C–S system at 5.3–5.5 GPa and 1300–1370°C

Cited by 24 publications

References 34 publications

Dissolution of diamond crystals in a heterogeneous (metal–sulfide–silicate) medium at 4 GPa and 1400 °C

Dissolution of diamond crystals in a heterogeneous (metal–sulfide–silicate) medium at 4 GPa and 1400 °C

Formation of two crystal modifications of Fe7C3−x at 5.5 GPa

Characterization of the nitrogen state in HPHT diamonds grown in an Fe–C melt with a low sulfur addition

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Formation of two crystal modifications of Fe₇C_3−x at 5.5 GPa