Optical and Vibrational Spectra of CsCl-Enriched GeS(2)-Ga(2)S(3) Glasses

Optical and FTIR spectroscopy was employed to study the properties of 80GeS(2)-20Ga(2)S(3)-CsCl chalcohalide glasses with CsCl additives in a temperature range of 77–293 K. It is shown that CsCl content results in the shift of fundamental absorption edge in the visible region. Vibrational bands in FTIR spectra of (80GeS(2)-20Ga(2)S(3))(100 − х)(СsCl)(x) (x = 5, 10, and 15) are identified near 2500 cm(−1), 3700 cm(−1),(,) around 1580 cm(−1), and a feature at 1100 cm(−1). Low energy shifts of vibrational frequencies in glasses with a higher amount of CsCl can be caused by possible thermal expansion of the lattice and nanovoid agglomeration formed by CsCl additives in the inner structure of the Ge-Ga-S glass.