Phase transformations in amorphous fullerite C60 under high pressure and high temperature |
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| Institution: | 1. National Research Centre “Kurchatov Institute”, Moscow, Russia;2. Moscow State University of Instrumental Engineering and Information Science, Moscow, Russia;3. Institute for High Pressure Physics, Troitsk, Moscow Region, Russia;1. Department of Physics, POSTECH, Pohang, South Korea;2. Pohang Accelerator Laboratory, POSTECH, Pohang, South Korea;3. Advanced Materials Research Lab, Department of Basic & Applied Sciences, Punjabi University, Patiala, Punjab, India;1. Department of Physics, ML Sukhadia University, Udaipur 313001, India;2. Department of Physics, College of Science, University of Tikrit, Tikrit, Iraq;3. Department of Physics, College of Education, University of Tikrit, Tikrit, Iraq;4. Department of Physics, Manipal University Jaipur, Jaipur 303007, India;5. Department of Pure and Applied Physics, University of Kota, Kota 324010, India;1. Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland;2. Faculty of Biological Sciences, University of Zielona Góra, Szafrana 1, 65-516 Zielona Góra, Poland;3. Institute of Molecular Physics, Polish Academy of Science, Smoluchowskiego 17, 60-179, Poznań, Poland;4. Joint Institute for Nuclear Research, 141 980 Dubna, Russian Federation;1. School of Science and Technology, Federal University of Rio Grande do Norte, Campus Universitário Lagoa Nova, 59078-970 Natal, RN, Brazil;2. Institute of Chemistry, Federal University of Rio Grande do Norte, Campus Universitário Lagoa Nova, 59072-970 Natal, RN, Brazil;3. Department of Fundamental Chemistry, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235 Cidade Universitária, 50670-901 Recife, PE, Brazil;1. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;2. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China |
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| Abstract: | First phase transformations of amorphous fullerite C60 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 С60 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. |
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| Keywords: | Amorphous materials Fullerenes High pressure Neutron scattering Phase transitions |
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