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Crystals 2018, 8(2), 68;

Pressure-Induced Transformation of Graphite and Diamond to Onions

Technological Institute for Superhard and Novel Carbon Materials, Centralnaya Str. 7a, 108840 Troitsk, Moscow, Russia
Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology MISiS, Leninskiy prospekt 4, 119049 Moscow, Russia
Department of Molecular and Chemical Physics, Moscow Institute of Physics and Technology State University, Institutskiy per. 9, 141700 Dolgoprudny, Moscow Region, Russia
International Laser Center, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia
Inorganic Nanomaterials Laboratory, National University of Science and Technology MISiS, Leninskiy Prospekt 4, 119049 Moscow, Russia
Author to whom correspondence should be addressed.
Received: 7 December 2017 / Revised: 16 January 2018 / Accepted: 29 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Non-Ambient Crystallography)
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In this study, we present a number of experiments on the transformation of graphite, diamond, and multiwalled carbon nanotubes under high pressure conditions. The analysis of our results testifies to the instability of diamond in the 55–115 GPa pressure range, at which onion-like structures are formed. The formation of interlayer sp3-bonds in carbon nanostructures with a decrease in their volume has been studied theoretically. It has been found that depending on the structure, the bonds between the layers can be preserved or broken during unloading. View Full-Text
Keywords: onions; carbon; high pressure onions; carbon; high pressure

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Blank, V.D.; Churkin, V.D.; Kulnitskiy, B.A.; Perezhogin, I.A.; Kirichenko, A.N.; Erohin, S.V.; Sorokin, P.B.; Popov, M.Y. Pressure-Induced Transformation of Graphite and Diamond to Onions. Crystals 2018, 8, 68.

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