Abstract
The effects of radiation-produced vacancies and of radiation-induced electrical conductivity (RIC) on the thermal conductivity of alumina at low temperatures have been calculated. The phonon scattering relaxation times for these mechanisms have been used in the evaluation of the thermal conductivity integral in order to determine the effect each mechanism has on the lattice thermal conductivity of alumina. It is found that vacancy scattering can significantly reduce the thermal conductivity; for example, a vacancy concentration of 0.01 per atom leads to a fractional change in thermal conductivity of about 90%. It is also concluded that the scattering of phonons by electrons in the conduction band due to RIC does not lead to a large reduction in the thermal conductivity.
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