Sb₂O₃ antimony oxide glasses have low phonon energy and non nonlinear optical properties χ³. They have potential optronic applications. This work deals with the synthesis and characterization of a glassy system based on antimony trioxide Sb₂O₃ - ZnBr₂ - LiCl. In this context differential scanning calorimetric analysis (DSC); thermo-mechanical analysis (TMA); the optical transmission and the elastic modulus have been made. The variation of physical properties has been discussed, in relation to the variation of the chemical composition. The good stability of some glasses qualified them to have a technological application.