Theoretical studies of phonon-dispersion curves and the polar-optical scattering process for 2H ${\mathrm{PbI}}_2$ are presented. A rigid-ion model with anisotropic effective charges is used to calculate the phonon-dispersion curves. The carrier mobility and its anisotropy due to polar-optical scattering as a function of temperature are calculated. Results are in good agreement with the experimental data.

• Received 10 September 1996

DOI:https://doi.org/10.1103/PhysRevB.55.8219