Characterization of new sulfur and selenium-based glasses containing lead iodide

The aim of this work is to investigate and qualify vitreous regions in new chalcogenide systems containing highly polarizable elements like S, Se, As, Sb, Bi, Pb and I. The sulfur based system, As₂S₃-Sb₂S₃-Bi₂S₃-PbI₂, as well as the selenium containing glasses As₂Se₃-Sb₂Se₃-PbI₂ have been studied. Large vitreous regions have been defined in the both systems: sulfur and selenium. Indeed, several glass compositions can accept in the vitreous network a molar concentration near 50% of PbI₂. Physical properties such as glass transition temperature, crystallization temperature, optical transmission, band-gap wavelength have been measured versus glassy compositions.