Vapor pressure of C{sub 70} fullerene

Journal Article · Thu Jun 06 04:00:00 EDT 1996 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/jp9531669· OSTI ID:263135

Piacente, V; Gigli, G; Scardala, P; Giustini, A; BArdi, G ^[1]

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1. Universita di Roma `La Sapienza` (Italy)

The equilibrium pressures over C{sub 70} were measured in the temperature range 783-904 K by the torsion effusion and Knudsen effusion methods. The obtained data are well represented by the following selected equation: log(p/Pa) = (11.38{+-}0.15) - (9917{+-}160)/(T/K). Assuming the vapor phase constituted by only C{sub 70(g)}, the sublimation standard enthalpy of this compound, {Delta}{sub sub}H{degree}(298) = 200{+-}6 kJ mol{sub -1}, as derived by second law elaboration of the experimental data, was derived. From the vapor pressure data, an evaluation of the free energy functions for solid C{sub 70} has been made. The heat of formation of gaseous C{sub 70}, {Delta}{sub for}H{degree}(298) = 2755{+-}18 kJ/mol{sub -1}, was also derived. 21 refs., 1 fig., 6 tabs.

• OSTI ID: 263135
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 23 Vol. 100; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXPERIMENTAL DATA
FORMATION HEAT
FREE ENERGY
FULLERENES
SUBLIMATION HEAT
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE