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Novel glasses in a Ga 2 S 3 -Sb 2 S 3 -AgI system were prepared with a melt-quenching method, and their glass-forming region was identified. The maximum dissolvable AgI in glasses was 65 mol%. The thermal, optical, and structural properties of glasses were investigated as a function of AgI and Ga 2 S 3 contents. The Ga 2 S 3 -Sb 2 S 3 -AgI glasses possess a wide region of transmission window (0.65-14 μm). An ionic conductivity of approximately 1.01 × 10 -3 S/cm can be obtained for a 40 (0.8Sb 2 S 3 -0.2Ga 2 S 3 )-60AgI glass at an ambient temperature, and the ionic conductivity increased as temperature increased. The relative activation energy of Ag + conduction was also calculated. These novel glasses show potential for the combined application of infrared optics and solid electrolytes.