LATTICE-DYNAMICS OF II-VI MATERIALS USING THE ADIABATIC BOND-CHARGE MODEL

We extend the adiabatic bond-charge model, originally developed for gr oup IV semiconductors and III-V compounds, to study phonons in more io nic II-VI compounds with a zinc-blende structure, Phonon spectra, dens ity of states, and specific heats are calculated for six II-VI compoun ds and compared with both experimental data and the results of other m odels. We show that the six-parameter bend-charge model gives a good d escription of the lattice dynamics of these materials. We also discuss trends in the parameters with respect to the ionicity and metallicity of these compounds.