Effect of SnI _2 on the thermal and optical properties of Ge-Se-Te glasses

摘要

A systematic series of (Ge _(20)Se _(15)Te _(65)) _(1-x)-(SnI _2) _x (x = 0, 0.05, 0.1, 0.15) chalcogenide glasses have been prepared. The amorphous nature can be confirmed by XRD and SEM. With the SnI _2 content increasing, the indirect optical band gaps are decreased from 0.662 to 0.622 eV according to Tauc laws. The introduction of SnI _2 makes the glasses much easier to prepare and more stable against crystallization, making them drawable as optical fibers. The highest ΔT (130 °C) value for (Ge _(20)Se _(15)Te _(65)) _(0.9)-(SnI _2) _(0.1) glass composition can be obtained. A slight red-shifting of the long-wavelength cutting-off edge from 18.4 to 19.4 μm was shown and it seems that SnI _2 in these glasses offers the improvement in the far-infrared properties.