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Pressure Response of the Higher Fullerene C 84 Studied by Raman and X-ray Scattering |
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| Authors: | S Assimopoulos KP Meletov GA Kourouklis I Margiolaki S Margadonna K Prassides |
| Institution: | 1. Physics Division, School of Technology , Aristotle University of Thessaloniki , GR-540 06 , Thessaloniki , Greece Phone: +3031995959 Fax: +3031995959 E-mail: assimop@vergina.eng.auth.gr;2. Physics Division, School of Technology , Aristotle University of Thessaloniki , GR-540 06 , Thessaloniki , Greece;3. Institute of Solid State Physics , Russian Academy of Sciences , Moscow region, Chernogolovka , 142432 , Russia;4. Physics Division, School of Technology , Aristotle University of Thessaloniki , GR-540 06 , Thessaloniki , Greece;5. School of Chemistry, Physics and Environmental Science , University of Sussex , Brighton , BN1 9QJ , UK;6. School of Chemistry, Physics and Environmental Science , University of Sussex , Brighton , BN1 9QJ , UK;7. NCSR "Demokritos" , Institute of Materials Science , 153 10 Ag. Paraskevi, Athens , Greece |
| Abstract: | The pressure behavior of the intramolecular phonon modes of the fullerene C 84 and its structural stability have been studied for the first time by means of Raman spectroscopy and synchrotron X-ray diffraction at high pressure up to ～10 GPa. The volume of the cubic unit cell has been measured as a function of pressure. The experimental data fitted by the Murnaghan equation-of-state (EOS) gave K_{0}=19.5\pm 0.9\,\hbox{GPa} and K_{0}^{\prime}=16.4\pm 0.6 . The pressure coefficients and Grüneisen parameters of the intramolecular phonon modes of C 84 have been determined and compared with those of other fullerenes. The data obtained do not show any phase transition and the pressure behavior of the material is entirely reversible in the pressure region investigated. |
| Keywords: | C84 Fullerenes High-pressure Raman Spectroscopy X-ray Scattering |