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We present first principles calculations of the phonon dispersions of Bi2Te3and discuss these in relation to the acoustic phonon interface scattering inceramics. The phonon dispersions show agreement with what is known from neutronscattering for the optic modes. We find a difference between the generalizedgradient approximation and local density results for the acoustic branches.This is a consequence of an artificial compression of the van der Waals bondedgaps in the Bi2Te3 structure when using the generalized gradient approximation.As a result local density approximation calculations provide a betterdescription of the phonon dispersions in Bi$_{2}$Te$_{3}$. A key characteristicof the acoustic dispersions is the existence of a strong anisotropy in thevelocities. We develop a model for interface scattering in ceramics withacoustic wave anisotropy and apply this to Bi2Te3 and compare with PbTe anddiamond.

Acoustic impedance and interface phonon scattering in Bi$_2$Te$_3$ and other semiconducting materials