S.M. Maloshtan, THE INFLUENCE OF PRESSURE, TEMPERATURE AND TIME ON THE FORMATION OF CUBIC GRAPHITE IN THE PROCESS OF FLUID SYNTHESIS WITH SUPERCRITICAL CO2 PARAMETERS
https://doi.org/10.15407/mineraljournal.48.02.057
UDC 54.057.549.67
THE INFLUENCE OF PRESSURE, TEMPERATURE AND TIME
ON THE FORMATION OF CUBIC GRAPHITE IN THE PROCESS
OF FLUID SYNTHESIS WITH SUPERCRITICAL CO2 PARAMETERS
S.M. Maloshtan, PhD Student
E-mail: scftechnology1@ukr.net; orcid: 0009-0001-0588-6221
V.I. Pavlyshyn, DrSc (Geology, Mineralogy), Prof.,
Academician of the AS Higher School of Ukraine, Head of Department
E-mail: V.I.Pavlyshyn@gmail.com; orcid: 0009-0003-1122-6494
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
Language: Ukrainian
Mineralogical journal 2026, 48 (2): 57-63
Abstract: Synthesis in a fluid with supercritical parameters is a universal method for high-temperature growth under high pressure of various substances. By the method of fluid synthesis at a pressure of up to 200 MPa and a temperature of 500-700 °C, carbon powder was obtained from carbon black and activated carbon by the reverse Boudoir reaction, which was identified as cubic graphite. This experiment continues previous developments on the topic of fluid synthesis of carbon modifications. The equipment on which the experiments were conducted allows to create in a short time the specified conditions in a wide range of pressure, temperature and time values. The schematic diagram of such equipment is presented in many works published by us earlier. It was experimentally found that in the case of the formation of carbon structures from the starting material (soot or activated carbon) at the RT parameters specified in the experiments, the cubic graphite structure dominates. The induction of the latter from soot occurred at higher values of P, T, while for activated carbon the main parameter of synthesis is its duration at lower values of P, T. The new results expand the picture of the formation of the cubic graphite phase depending on the thermodynamic parameters of the experiment and fit into the framework of the previously proposed new model of the formation of carbon phases. It is shown that pressure; temperature and time significantly affect the formation of cubic graphite. In particular, pressure is the main factor in a significant increase in the yield of powder during synthesis. Temperature and time also increase the yield of cubic graphite, but have their own optimum. To work out the optimal modes for obtaining cubic graphite of a perfect structure, we can use the results we obtained of the influence of various starting substances during its synthesis.
Keywords: fluid synthesis, diamond, cubic graphite, fullerite pressure, temperature, time.
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