Far-infrared transmission and bonding arrangement in Ge10Se90−xTex semiconducting glassy alloys

The far-infrared spectra of Ge10Se90−xTex where x = 0, 10, 20, 30, 40, 50 glassy alloys were measured in the wavenumber region 50–650 cm−1 at room temperature. The results were explained in terms of the vibrations of the isolated molecular units. The addition of Te in Ge10Se90 has shown the appearance of GeTe2 and GeTe4 molecular units and vibrations of Se–Te bond as Se8−xTex mixed rings. The assignment of various absorption bands has been made on the basis of absorption spectra of pure Se, binary Ge–Se, Ge–Te, Se–Te and ternary Ge–Se–Te glassy alloys. The far-infrared transmission spectrum has been found to shift a little towards lower wavenumber side with the addition of Te content to Ge10Se90. The addition of Te to Ge–Se system replacing Se has found to reduce the Se–Se bonds and Ge–Se bonds and leads to the formation of Se–Te, Ge–Te and Te–Te bonds.