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DSC study of annealing and phase transformations of C60 and C70 polymerized under pressures in the range 9.5-13 GPa |
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| Authors: | S BugaV Blank,Å FranssonN Serebryanaya,B Sundqvist |
| Affiliation: | a Technological Institute for Superhard and Novel Carbon Materials, Ministry of Science and Technologies of Russia, Troitsk, Moscow Region, 142190, Russia b Department of Applied Physics and Electronics, Umeå University, 90187 Umeå, Sweden c Institute of Spectroscopy RAS, Troitsk, Moscow Region, 142092, Russia d Department of Experimental Physics, Umeå University, 90187 Umeå, Sweden |
| Abstract: | C60 and C70 fullerenes polymerized under pressures between 9.5 and 13 GPa and temperatures between 670 and 1850 K were investigated by differential scanning calorimetry (DSC) in the range 240-640 K. Endothermal heat effects were observed with a peak maximum just below 540 K, a temperature characteristic for breakdown of (2+2) intermolecular links in dimers, 1D and 2D polymers. Exothermal effects, starting from 380 K, were observed for the first time in polymeric fullerenes. These effects are attributed to relaxation processes and to breakdown of other types of intermolecular bonds such as common four-sided rings and (3+3) interlinks. |
| Keywords: | A. Fullerenes C. Differential scanning calorimetry (DSC) C. X-ray diffraction D. Phase transitions |
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