Abstract

Using a phenomenological lattice dynamical scheme in the Greens function framework we have studied the phonon modes in both perfect and imperfect cubic boron nitride and boron phosphide. A novel optimization procedure is considered for determining the eleven force constant parameters of a second-nearest neighbor Rigid-ion model. Simple perturbation models are used for describing the impurity vibrations of isolated defects. Good agreement with the experimental data is obtained, whenever a comparison is possible: in fact most of the results are predictions.

© 1995 Optical Society of America