Glasses that contain both chalcogen and halogen atoms, known as chalcohalide glasses, have attracted considerable attention in view of their IR transparency and other photonic properties. Novel glasses from the chalcohalide system (AgI)_x (GeS_1.5)_100-x with atomic ratio S/Ge=1.2 and 1.5 and AgI content 5 ≤ x_AgI ≤ 20 have been synthesized. Structural information for these glasses has been obtained by studying their vibrational properties by Raman and FTIR spectroscopy. The combination of these complementary techniques enabled us to identify the structural units building up the glassy network and elucidate the role of AgI as component of the (AgI)_x (GeS_1.5)_100-x quasi binary system.

         The structure of Ge–rich glassy matrix is composed of mixed GeS_nGe_4-n tetrahedra, being appreciably different than that of the stoichiometric GeS₂ glass. The addition of AgI causes considerable structural changes due to the distinctive roles of silver and iodine. The network terminating role of iodine atoms, as well as the presence of silver cations and their impact on vibrational modes are discussed and compared with literature data on similar chalcohalide glasses.

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