Physicochemical analysis and crystal chemistry of metastable transformations on the carbon state diagram
https://doi.org/10.29235/1561-8323-2025-69-6-521-528
Abstract
Based on crystal-chemical and physicochemical analysis of the diamond formation, topological transformation was carried out diagram models states carbon. A phase diagram of metastable transformations is proposed, with consideration given to the energy absorbed by dissipative structures. The diagram defines the positions of the lines describing phase transitions, their number, increasing as a result of the formation of transition structures, depending on the temperature, pressure and amount of absorbed energy. The diagram highlights new areas of phase formation during the formation of natural minerals, including impact diamonds with lonsdaleite, transition areas of precipitation from the liquid of ultradispersed diamond particles and microgroups of graphite and lonsdaleite. The carbon phase diagram identified grains of highpressure carbon phases of the Popigai deposit – impact diamonds formed during the collision of a meteorite with graphitecontaining rocks. Relatively transparent, large superhard grains of the mineral are impact diamond-lonsdaleite abrasive. Virtually opaque, dark grains of the mineral, formed during impact with shear, are sprouts of ultra-dispersed diamond particles with microgroups of graphite and lonsdaleite.
About the Authors
P. A. Vityaz
United Institute of Mechanical Engineering of the National Academy of Sciences of Belarus
Belarus
Belarus
Vityaz Petr A. – Academician, D. Sc. (Engineering), Professor, Chief Researcher
12, Akademicheskaya Str., 220072, Minsk
M. L. Kheifetz
Institute of Applied Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Kheifetz Mikhail L. – D. Sc. (Engineering), Professor, Director
16, Akademicheskaya Str., 220072, Minsk
V. T. Senyut
United Institute of Mechanical Engineering of the National Academy of Sciences of Belarus
Belarus
Belarus
Senyut Vladimir T. – Ph. D. (Engineering), Leading Researcher
12, Akademicheskaya Str., 220072, Minsk
N. P. Pokhilenko
S. S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Pokhilenko Nikolay P. – Academician of the RAN, D. Sc. (Geology), Professor, Chief Researcher
3, Koptyug Ave., 630090, Novosibirsk
V. P. Afanasyev
S. S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Afanasyev Valentin P. – D. Sc. (Geology), Professor, Chief Researcher
3, Koptyug Ave., 630090, Novosibirsk
D. Yu. Kolodyazhny
Moscow State Technological University “STANKIN”
Russian Federation
Russian Federation
Kolodyazhny Dmitriy Yu. – D. Sc. (Engineering), Professor, Vice-rector
1, Vadkovsky Lane, 127065, Moscow
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