PHONON-DISLOCATION DIPOLE INTERACTION IN LiF AT LOW TEMPERATURE

We compare the effects of isolated dislocations and a somewhat larger density of edge dislocation dipoles on thermal conductivity, specific heat, and ultrasonic velocity and attenuation in alkali halides such as LiF. The motivation for this study is to check the implications of earlier work where it was demonstrated that the effect of deformation on thermal conductivity in LiF could not be accounted for by dynamic scattering by a dislocation density equal to the etch pit density, but could be fit assuming scattering was due to the "optical" mode of vibration of a much larger density of dislocation dipoles