najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-972Research ArticleOTHERSOTHERSSynergistic influence of fluorine and hydrogen on processes of thermal transformations of carbon-containing systems under high pressuresDavydovV. A.

Troitsk, Moscow

vdavydov@hppi.troitsk.ruRakhmaninaA. V.

Troitsk, Moscow

avrakhman@yandex.ruAgafonovV. N.

UMR CNRS-CEA 6157

agafonov@univ-tours.frKhabasheskuV. N.

Department of Chemical and Biomolecular Engineering

valery@uh.eduL.F. Vereshchagin Institute for High Pressure Physics of the RASRussian FederationGREMAN Universite F. Rabelais ToursGermanyUniversity of HoustonUnited States20141508202551167171Copyright © Davydov V.A., Rakhmanina A.V., Agafonov V.N., Khabashesku V.N., 20252025Davydov V.A., Rakhmanina A.V., Agafonov V.N., Khabashesku V.N.Davydov V.A., Rakhmanina A.V., Agafonov V.N., Khabashesku V.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/972

Thermal transformations of naphthalene (C10H8), octafluoronaphthalene (C10F8) and their binary mixtures at 8.0 GPa have been investigated by X-ray diffraction, Raman spectroscopy, scanning and transmission microscopies. As a result, the pronounced synergistic effect of fluorine and hydrogen on mechanisms, p, T parameters and products of pressure-temperature-induced transformations of carbon-containing systems has been established. Simultaneous presence of fluorine and hydrogen gives rise to significant reduction of the temperature thresholds (TT) for carbonization, graphitization and diamond formation in C10H8 – C10F8 mixtures in comparison with the TT values for pure C10H8 and C10F8 at the same pressure. This synergistic effect manifests itself also in the simultaneous presence in the products of transformation of both nano- and micrometer-sized diamond fractions. The reasons of formation of different diamond fractions in the products of binary mixture treatment are discussed in this work.

High pressureHigh temperatureTransformationsNanocarbon materialsThis work was supported by the Russian Foundation for Basic Research (Grant No. 12- 03-00787).ReferencesDavydov V.A., Rakhmanina A.V., Agafonov V.N., Khabashesku V.N. Synergistic effect of fluorine and hydrogen on processes of graphite and diamond formation from fluorographite-naphthalene mixtures at high pressures. The Journal of Phys. Chem. C, 115, P. 21000–21008 (2011).Davydov V.A., Rakhmanina A.V., Agafonov V.N., Khabashesku V.N. Synergistic effect of fluorine and hydrogen on processes of graphite and diamond formation from fluorographite-naphthalene mixtures at high pressures. The Journal of Phys. Chem. C, 115, P. 21000–21008 (2011).Bundy F.P., Bassett W.A., et al. The pressure-temperature phase and transformation diagram for carbon. Carbon, 34 (2), P. 141–153 (1996).Bundy F.P., Bassett W.A., et al. The pressure-temperature phase and transformation diagram for carbon. Carbon, 34 (2), P. 141–153 (1996).

The authors declare that there are no conflicts of interest present.