Similarity laws and thermodynamic quantities for fullerite C60

✍ Scribed by V.S. Vorob'ev; A.V. Eletskii

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 379 KB
• Volume: 254
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00329-6

✦ Synopsis

The crystal structure of solid fullerite C6o at temperatures exceeding 260 K is the face centered cubit one. The intermolecular interaction in this crystal is short range so each C6o molecule interacts only with the neares~ neighbors. Substances having the mentioned features form a class of those with some common properties. Thus the thermodynamic behavior of substances belonging to this class is governed by similarity laws in accordance with which the ther~nodynamic parameters are dimensionless functions of quantities constructed of the molecular mass p,, temperature T, well depth in the intermolecular interaction potential D and equilibrium intermolecular distance R o. One of these similarity laws has been used to process known data related to the pressure vapor temperature dependences for fullerite C6o. Thi~ permits a refinement of the magnitude D = 0.257 + 0.01 eV known up to now with more uncertainty. This magnitudei is used for checking the fulfilment of similarity laws for those fullerite thermodynamic parameters for which experimer~tal data are available. The fulfilment of similarity laws permits an estimation of the critical parameters, melting and boili~ag temperatures, bulk modulus and also the Debye temperature for fullerite. The obtained data are analyzed in terms of the possibility of the existence of fullerene in the liquid state.