Lattice dynamics of II–VI,III–V compounds

The lattice vibrations of II–VI compound ZnSe and III–V compound InSb have been calculated in the frame work of Banerjee-Varshni's second neighbour ionic SNI] model utilizing critical-point phonons as an input to determine the required seven parameters and the experimentally determined three elastic constants C₁₁, C₁₂, C₄₄ as restraints on the values of the parameters. A reinvestigation of the experimental elastic constants particularly C₁₁ and C₄₄ for ZnSe has been suggested. Results are presented for the dispersion curves along high symmetry directions. A reasonable agreement with the recently measured inelastic nutron scattering data is observed.