Optical properties and crystallization of GeSe2 -Sb2 Se3 -CsCl glasses

Chalcohalide glasses 20GeSe(2)-(80 - x) Sb-2 Se-3-xCsCl (x = 2, 4, 8, 10 mol%) were synthesized by the conventional melt-quenching method. The optical transmission spectra were measured from the visible to the far-infrared range. The effect of CsCl content on the short-edged wavelength was investigated. Moreover, the differential thermal analysis curves of a typical 20GeSe(2)-76Sb(2) Se-3-4CsCl glass were measured under different heating rates, and its crystallization kinetics was analyzed under the non-isothermal condition. The results show that, the introduction of CsCl into the glass lowers the non-bonding energy level, which leads to the increase of the electronic bandgap E-g, and blue-shift of the short edged wavelength. Compared with the conventional Johnson-Mehl-Avrami model, the autocatalytic model gives a better description of the kinetic process for the glass sample.