Effect of Ge-rich Ga-Ge-Sb-Se glass composition on the optical and thermal properties

Abstract Ge-rich Ga-Ge-Sb-Se glasses with relatively high glass transition temperature and low tendency to crystallization are synthesized. Glass composition effect on the optical and thermal properties is discussed. Analysis of structural units shows the increase in the fraction of Ge–Ge homopolar bonds in the glass network, from 16 to 43%, as the germanium and gallium contents are increased in the 26–29 and 1–5 at.%, respectively. For different glass compositions, the refractive index dispersion in the 500–3000 nm wavelength range is characterized with using the model that takes into account absorption. Correlations between structural features of glasses and physical properties are discussed.