Raman spectra and structure of GeAsS glasses in the S-rich region

Abstract

The Raman spectra of Ge_xAs_yS_z glasses have been studied in the ternary composition region of GeS₂-As₂-S. Dominant features of the obtained spectra were discussed and the structural units forming the disordered structural network of Ge_xAs_yS_z glasses were identified as: GeS₄ tetrahedra, AsS₃ pyramids, As-S-S-As bent chains and S_n (n = 2–4) chain segments. At high sulfur concentrations a part of the sulfur is dissolved in the structural network in the form of S₈ molecules.