Infrared vibrational Modes in Tl3SbS3, Tl3AsS3, and Tl3AsSe3 crystals |
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Authors: | N N Syrbu V T Krasovsky I N Grincheshen |
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Abstract: | Reflectivity spectra of Tl3SbS3, Tl3AsS3, and Tl3AsSe3 crystals have been investigated in the wave number range 50–600 cm?1 for the polarizations E∥c and E?c. The fundamental phonon parameters, the limiting dielectric constants ?∞ and ?S and the reflectivity spectra contours have been calculated by using classical dispersion relations for both E∥c and E?c configurations. The Szigeti effective charges and the relative ion charges of As, Tl, Sb, Se, S anions and cations have been calculated in dependence on the incident light polarization. |
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