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Thermal Diffusivity/Conductivity of Compacts of C 60 Buckminsterfullerene and a C 60 –C 70 Mixture
Author(s) -
Withers James C.,
Loutfy Raouf O.,
Donaldson Kimberly Y.,
Hasselman D. P. H.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03671.x
Subject(s) - buckminsterfullerene , thermal diffusivity , thermal conductivity , graphite , fullerene , materials science , phonon , scattering , phonon scattering , analytical chemistry (journal) , chemistry , thermodynamics , condensed matter physics , composite material , organic chemistry , optics , physics
The thermal diffusivity/conductivity at room temperature of a compact of C 60 buckminsterfullerene with a density ∼94.5% of theoretical was found to be about one‐half of the literature value for a C 60 single crystal. With increasing temperature to about 500°C, the thermal diffusivity was found to decrease with ∼T −1 dependence, indicative of phonon‐phonon scattering. A compact of a C 60 –C 70 mixture with density comparable to that of the C 60 compact exhibited a thermal diffusivity/conductivity about one‐half that of the C 60 compact, this decrease possibly attributable to enhanced phonon scattering because of the mass differences of the C 60 and the C 70 molecules. The specific heat values of the C 60 and the C 60 –C 70 compacts were about the same as that of graphite, with a similar dependence on temperature. Although both the C 60 and the C 60 –C 70 compacts appeared to disintegrate spontaneously at elevated temperatures, this tendency appeared to be less pronounced for the C 60 than for the C 60 –C 70 compacts.