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The effects of the bond-bending coefficient on the thermal expansion coefficient of graphite parallel to the hexagonal axis

โœ Scribed by B.T. Kelly

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
197 KB
Volume
11
Category
Article
ISSN
0008-6223

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โœฆ Synopsis

A calculation is presented of the hexagonal axis thermal expansion coefficient of a graphite crystal up to 1000ยฐK using the measured values of two of the three anharmonic coefficients which affect the out-of-plane acoustic vibrational mode. The third anharmonic coefficient (&/ae,,), which is determined by changes in the bondbendine: constant of a laver plane with interlayer spacing, is shown to lie in the range 0 to -0.50 x" 10m3 cm2/sec. ' *

COEFFCIENT OF GRAPHITE 381

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A calculation is made of the effects on the hexagonal axis thermal expansion coefficient of a graphite crystal of the changes in the interlayer forces due to the large inter-layer expansions. It is found that the expansion coefficient is significantly increased at temneratures above 800ยฐK and that t