MORPHOLOGY OF DIAMONDS DISSOLVED IN THE Fe-S MELT AT DIFFERENT SULFUR CONTENTS

An experimental study of the process of the dissolution of diamonds in a sulfur-containing iron melt with different contents of sulfur (10, 15, 20, 25, 30 wt. %) at 3,5 GPa and 1400°C has been carried out. The obtained results indicate that under the realized conditions, the plane-faced diamond crystals of octahedral habit are transformed into a curved octahedroid shape with morphological characteristics similar to natural diamonds from kimberlites. It has been concluded that metal- sulphide melts, given their relatively low melting points, could affect the safety of diamonds in the mantle. The presence of sulfur reduces the solubility of carbon and tends to zero in the Fe-S melt compositions close to eutectic (25 and 30 wt. %). That is, the presence of sulfur has a favorable effect on the stability of diamonds.

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Morphological characteristics of diamond crystals arising as the result of dissolution in Fe-Ni-S MELT at high pressure

Доклады Академии наук ◽

10.31857/s0869-56524895497-501 ◽

2019 ◽

Vol 489 (5) ◽

pp. 497-501

Author(s):

I. A. Gryaznov ◽

E. I. Zhimulev ◽

V. M. Sonin ◽

E. S. Lindenblot ◽

A. A. Chepurov ◽

...

Keyword(s):

High Pressure ◽

Morphological Characteristics ◽

Morphological Features ◽

Natural Diamonds ◽

Diamond Crystals ◽

Kimberlite Magma ◽

First Results

The first results on the dissolution of flat-faced diamond crystals of octahedral habit in Fe-Ni-S melt at 3,5 GPa and 1400 С are presented. It has been established that as a result of dissolution, flat-faceted diamond crystals are transformed into curve-faced individuals with morphological features similar to kimberlite diamonds. It is concluded that similar forms of natural diamonds could have been formed in reducing domains of the Earths mantle before entering the kimberlite magma.

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EXPERIMENTAL STUDY OF THE STABILITY OF NbTi COMPOSITE CONDUCTOR UNDER THE INFLUENCE OF PULSED MAGNETIC FIELD

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19841101 ◽

1984 ◽

Vol 45 (C1) ◽

pp. C1-495-C1-498

Author(s):

Yi Changlian ◽

Chang Hung ◽

Yan Luguang ◽

Chen Jinlin

Keyword(s):

Magnetic Field ◽

Experimental Study ◽

Pulsed Magnetic Field ◽

The Stability ◽

Composite Conductor

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A simulation apparatus for the experimental study of batch reactor control methods

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19861259 ◽

1986 ◽

Vol 51 (6) ◽

pp. 1259-1267

Author(s):

Josef Horák ◽

Petr Beránek

Keyword(s):

Experimental Study ◽

Closed Loop ◽

Dynamic Properties ◽

Batch Reactor ◽

Exothermic Reaction ◽

Electric Heating ◽

Batch Reactors ◽

Exchange Area ◽

The Stability ◽

Methods Of Control

A simulation apparatus for the experimental study of the methods of control of batch reactors is devised. In this apparatus, the production of heat by an exothermic reaction is replaced by electric heating controlled by a computer in a closed loop; the reactor is cooled with an external cooler whose dynamic properties can be varied while keeping the heat exchange area constant. The effect of the cooler geometry on its dynamic properties is investigated and the effect of the cooler inertia on the stability and safety of the on-off temperature control in the unstable pseudostationary state is examined.

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Effects of energy density attenuation on the stability of keyhole and molten pool during deep penetration laser welding process: A combined numerical and experimental study

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2021.121410 ◽

2021 ◽

Vol 176 ◽

pp. 121410

Author(s):

Yilin Wang ◽

Ping Jiang ◽

Jintian Zhao ◽

Shaoning Geng ◽

Boan xu

Keyword(s):

Experimental Study ◽

Energy Density ◽

Laser Welding ◽

Molten Pool ◽

Welding Process ◽

Deep Penetration ◽

The Stability ◽

Laser Welding Process

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An experimental study comparing the stability of colloidal dispersion gels with normal polymeric solutions for enhanced‐oil‐recovery purposes

The Canadian Journal of Chemical Engineering ◽

10.1002/cjce.23929 ◽

2020 ◽

Author(s):

Reza Rahimi ◽

Amir Hossein Saeedi Dehaghani

Keyword(s):

Experimental Study ◽

Enhanced Oil Recovery ◽

Oil Recovery ◽

Colloidal Dispersion ◽

Polymeric Solutions ◽

The Stability

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An experimental study of the stability and performance characteristics of a Hybrid Solar Receiver Combustor operated in the MILD combustion regime

Proceedings of the Combustion Institute ◽

10.1016/j.proci.2018.05.099 ◽

2019 ◽

Vol 37 (4) ◽

pp. 5687-5695 ◽

Cited By ~ 11

Author(s):

A. Chinnici ◽

G.J. Nathan ◽

B.B. Dally

Keyword(s):

Experimental Study ◽

Combustion Regime ◽

Performance Characteristics ◽

Mild Combustion ◽

And Performance ◽

The Stability ◽

Solar Receiver

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Bioinspired organometallic chemistry

Pure and Applied Chemistry ◽

10.1351/pac200274010115 ◽

2002 ◽

Vol 74 (1) ◽

pp. 115-122 ◽

Cited By ~ 24

Author(s):

Lanny S. Liebeskind ◽

Jiri Srogl ◽

Cecile Savarin ◽

Concepcion Polanco

Keyword(s):

Organometallic Chemistry ◽

Refractory Metal ◽

Redox Active ◽

The Stability ◽

New Procedures ◽

Sulfur Containing ◽

Insight Into

Given the stability of the bond between a mercaptide ligand and various redox-active metals, it is of interest that Nature has evolved significant metalloenzymatic processes that involve key interactions of sulfur-containing functionalities with metals such as Ni, Co, Cu, and Fe. From a chemical perspective, it is striking that these metals can function as robust biocatalysts in vivo, even though they are often "poisoned" as catalysts in vitro through formation of refractory metal thiolates. Insight into the nature of this chemical discrepancy is under study in order to open new procedures in synthetic organic and organometallic chemistry.

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