Abstract
The interaction between high-frequency ballistic phonons and mass defects in LiF of natural isotopic composition has been studied with the use of a heat-pulse technique. Studies were made as a function of input power for samples of various length oriented along the [111] direction. The results indicate that surface imperfections have a profound effect on the transmission of high-frequency phonons. The experiments on suitably prepared surfaces yield a phonon scattering rate which is in excellent agreement with theoretical predictions and thermal conductivity measurements.
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