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A calculation of the elastic constant c33 of a graphite crystal as a function of temperature

✍ Scribed by B.T. Kelly

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
536 KB
Volume
12
Category
Article
ISSN
0008-6223

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✦ Synopsis

A calculation is presented of the elastic constant CM of a graphite crystal as a function of temperature up to 2500 K, taking into account the anharmonic contribution and the changes in interlayer interactions due to the large lattice thermal expansion. Parametric variations in the theory show that the anharmonic contribution to G depends principally on the parameter (a'C,,/~e~,). Comparison of theoretical results with the experimental data, which is mainly from neutron scattering experiments, shows that the data can be accounted for if (a*CJae~,) lies in the range 7-10 X 10" dynes/cm*. A theoretical estimate of (a'C,,/ae?,) based on Lennard-Jones potentials between atoms in adjacent basal planes gives a value of 9.07 X lOI dynes/cm?.

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