Infrared studies of Se-based polynary chalcogenide glasses (III): YxZxSxSe100?3x (Y = Ge,As; Z = As,Te)

The infrared (IR) absorption spectra for Y_xZ_xS_xSe_100?3x glasses (Y = Ge, As; Z = As, te), with x = 2.5 and 5.0, are measured in the wavenumber region 700-60 cm^?1 at room temperature. These IR spectra are qualitatively explained by comparing with the IR spectra of the binary and ternary glasses. In Ge_xAs_xS_xSe_100?3x glasses (x ? 5.0), the main spectral features are explained by both spectra of the two ternary glasses Ge_xS_xSe_100?2x and As_xS_xSe_100?2x. In Ge_xS_xTe_xSe_100?3x glasses (x ? 5.0), the main spectral features are well explained by both spectra of the two ternary glasses Ge_xS_xSe_100?2x and Ge_xTe_xSe_100?2x. On the other hand, main spectral features in As_xS_xTe_xSe_100?3x glasses (x ? 5.0) are well explained by both spectra of the ternary glasses As_xS_xSe_100?2x and the binary glasses Se_100?xTe_x. In these glasses with low concentrations (x ? 5.0) some chemical bonds are confirmed and some structural units estimated.