Influence of NaX (X=I or Cl) additions on GeS2–Ga2S3 based glasses

Abstract Chalcogenide glasses in the pseudo-ternary system Na X– GeS 2 –Ga 2 S 3 ( X =Cl or I) were synthesized. Different series were investigated in order to highlight the influence of the sodium halide addition on two different host glasses (GeS 2 ) 80 (Ga 2 S 3 ) 20 and (GeS 2 ) 72 (Ga 2 S 3 ) 28 . Macroscopic properties including density and characteristic temperatures, such as glass transition temperatures T g and crystallization temperature T x , were determined for a maximum molar content of Na X equal to 15%. The evolution of the optical band-gap and the chemical stability following the composition were also studied. Conductivity measurements were also performed and compared to other Li-based GeS 2 –Ga 2 S 3 glasses. The results were discussed taking into account the cation and anion nature and also the glass packing density.