The infrared transmittance and Raman scattering spectra in TlGa_xIn_{1-x}S_2 (0 ≤ x ≤1) layered mixed crystals grown by the Bridgman method were studied in the frequency ranges of 400-2000 and 250-400 cm^{-1}, respectively. The bands observed at room temperature in IR transmittance spectra of TlGa_xIn_{1-x}S_2 were interpreted in terms of multiphonon absorption processes. The dependences of the frequencies of IR- and Raman-active modes on the composition of TlGa_xIn_{1-x}S_2 mixed crystals were also established. The structural characterization of the mixed crystals was investigated by means of X-ray diffraction measurements and compositional dependence of lattice parameters was revealed.
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