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The effect of doping on the thermal conductivity of polycrystalline graphite

โœ Scribed by B.T. Kelly; A. Whittaker; D. Tobin; P. Wagner

Publisher
Elsevier Science
Year
1971
Tongue
English
Weight
590 KB
Volume
9
Category
Article
ISSN
0008-6223

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โœฆ Synopsis

Experimental data are presented on the changes of thermal conductivity of a number of polycrystalline graphites due to doping with boron and bromine, which respectively represent a substitutional and interstitial acceptor type defect. The results are compared with changes in thermal conductivity due to interstitial atoms and vacancies introduced by fast neutron irradiation. It is found that a substitutional boron atom in its ability to scatter phonons is roughly comparable to a lattice vacancy. The temperature dependence of the additional thermal resistance due to all four types of defects is found to be similarly increasing with decreasing temperature. A detailed attempt to fit a theoretical curve to the thermal conductivity results indicates that the mean free path for phonon scattering by point defects is independent of phonon frequency.

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