Phonon Scattering by Lattice Defects in Deformed Bismuth Crystals

抄録

The phonon scattering by vibrating dislocation dipoles and the scattering by twin boundaries are discussed to explain the thermal conductivity of deformed crystals of bismuth and its dilute alloys. The scattering of phonons by vibrating dislocation dipoles was calculated by employing Ninomiya’s formulae of eigenvibrations of an edge dislocation dipole, and the results were successful to explain the thermal conductivity of bismuth crystals deformed by slip. The thermal conductivity of twinned bismuth crystals was calculated by assuming that the scattering of phonons obeys the scattering law of a long wavelength acoustic wave scattered by a plane interface between twin-related media. The results are in reasonably good agreement with the experiments.