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Phase transformations in amorphous fullerite C60 under high pressure and high temperature.

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Title: Phase transformations in amorphous fullerite C60 under high pressure and high temperature.
Authors: Borisova, P.A.1, Blanter, M.S.2 mike.blanter@gmail.com, Brazhkin, V.V.3, Somenkov, V.A.1, Filonenko, V.P.3
Source: Journal of Physics & Chemistry of Solids. Aug2015, Vol. 83, p104-108. 5p.
Subjects: Fullerenes, Phase transitions, Amorphous substances, High pressure chemistry, High temperature metallurgy
Abstract: First phase transformations of amorphous fullerite C 60 at high temperatures (up to 1800 K) and high pressures (up to 8 GPa) have been investigated and compared with the previous studies on the crystalline fullerite. The study was conducted using neutron diffraction and Raman spectroscopy. The amorphous fullerite was obtained by ball-milling. We have shown that under thermobaric treatment no crystallization of amorphous fullerite into С 60 molecular modification is observed, and it transforms into amorphous-like or crystalline graphite. A kinetic diagram of phase transformation of amorphous fullerite in temperature–pressure coordinates was constructed for the first time. Unlike in crystalline fullerite, no crystalline polymerized phases were formed under thermobaric treatment on amorphous fullerite. We found that amorphous fullerite turned out to be less resistant to thermobaric treatment, and amorphous-like or crystalline graphite were formed at lower temperatures than in crystalline fullerite. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:First phase transformations of amorphous fullerite C 60 at high temperatures (up to 1800 K) and high pressures (up to 8 GPa) have been investigated and compared with the previous studies on the crystalline fullerite. The study was conducted using neutron diffraction and Raman spectroscopy. The amorphous fullerite was obtained by ball-milling. We have shown that under thermobaric treatment no crystallization of amorphous fullerite into С 60 molecular modification is observed, and it transforms into amorphous-like or crystalline graphite. A kinetic diagram of phase transformation of amorphous fullerite in temperature–pressure coordinates was constructed for the first time. Unlike in crystalline fullerite, no crystalline polymerized phases were formed under thermobaric treatment on amorphous fullerite. We found that amorphous fullerite turned out to be less resistant to thermobaric treatment, and amorphous-like or crystalline graphite were formed at lower temperatures than in crystalline fullerite. [ABSTRACT FROM AUTHOR]
ISSN:00223697
DOI:10.1016/j.jpcs.2015.04.001