Abstract
The IR reflection and the Raman spectra of ZnS1−x Sex crystals (0≤ x ≤ 1) are measured. The mode dispersion of the solid solutions is found to deviate from that calculated using an isodisplacement model. The reasons behind this deviation are discussed. Two additional modes are found in the frequency range between the ZnS-like TO and LO modes. It is assumed that one of them is a line of the second-order spectrum amplified by the Fermi resonance and the other is linked to the resonance (additional local) mode of Se impurity atoms. The latter conclusion is confirmed by calculating the spectrum of a Se impurity in a ZnS crystal in terms of the microscopic lattice dynamics theory in the low impurity concentration approximation. The oscillator strengths of the main and additional optical phonons in ZnS1−x Sex solid solutions are discussed.
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Original Russian Text © E.A. Vinogradov, B.N. Mavrin, N.N. Movikova, V.A. Yakoviev, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 10, pp. 1826–1834.
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Vinogradov, E.A., Mavrin, B.N., Novikova, N.N. et al. Mode dispersion in the optical-phonon spectra of mixed crystals ZnS1−x Sex . Phys. Solid State 48, 1940–1946 (2006). https://doi.org/10.1134/S1063783406100210
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DOI: https://doi.org/10.1134/S1063783406100210