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The thermal conductivities of three specimens of well-oriented, annealed pyrolytic graphite have been measured over the temperature range 100–900°K. The conductivity parallel to the deposition plane is analysed in terms of mean free paths using the semi-continuum model of Komatsu and Nagamiya. An expression is derived for the phonon mean free path due to Umklapp scattering. A temperature independent phonon mean free path results from boundary scattering. The conductivity perpendicular to the deposition plane has been fitted to the Leibfried-Schlomann equation.
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Rex N. Taylor (1966) studied this question.
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