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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]
Copyright of Journal of Physics & Chemistry of Solids is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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An: 102592790
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PubType: Academic Journal
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+%26+Chemistry+of+Solids%22">Journal of Physics & Chemistry of Solids</searchLink>. Aug2015, Vol. 83, p104-108. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Fullerenes%22">Fullerenes</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Amorphous+substances%22">Amorphous substances</searchLink><br /><searchLink fieldCode="DE" term="%22High+pressure+chemistry%22">High pressure chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperature+metallurgy%22">High temperature metallurgy</searchLink>
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  Data: 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]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Physics & Chemistry of Solids is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jpcs.2015.04.001
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        Text: English
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        Type: general
      – SubjectFull: Phase transitions
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      – SubjectFull: Amorphous substances
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      – SubjectFull: High pressure chemistry
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      – SubjectFull: High temperature metallurgy
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              Text: Aug2015
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