The frequency---wave-vector dispersion relations for the normal modes of vibrations for zinc and cadmium tellurides, crystallizing in the zinc-blende crystal structure, have been calculated in the framework of the second-neighbor-ionic model. The frequencies of four critical-point phonons [LO(Γ), TO(Γ), LO(X), and TA(X)] obtained by infrared- and Raman-scattering measurements and the three elastic constants c₁₁, c₁₂, and c₄₄ have been employed as input data so as to calculate the involved seven lattice-dynamical model parameters. Absorption maxima in the infrared and/or second-order Raman-scattering experiments have been tentatively assigned by an extensive use of the lattice-dynamical-calculated critical phonons. The calculated phonon frequencies show a reasonably satisfactory agreement with the available optical data.
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Talwar et al. (1973) studied this question.
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