Chemical order in Ga or Sb modified germanium sulfide glasses around stoichiometry High-resolution XPS and Raman studies

Abstract : To understand the unique features of germanium sulfide (~60–70 at.% of S) glasses modified with Ga or Sb, the chemical order in these materials is investigated using X-ray photoelectron spectroscopy (XPS). The obtained results are correlated with Raman spectroscopy data and verified with quantum chemical calculations. It is shown that in addition to the regular corner-shared and S–S-shared [SbS3/2] pyramids and [GeS4/2] tetrahedra, a fraction of these structural units can form edge-shared fragments. The obtained XPS results also support the possibility for [SbS5/2] distorted square pyramids formation in Sb-rich glasses. At higher concentrations of antimony, a tendency to the increased concentration of homopolar bonds is observed. © 2018 Elsevier B.V.
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Submitted on : Friday, September 14, 2018 - 3:46:09 PM
Last modification on : Thursday, August 22, 2019 - 2:40:02 PM

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R. Golovchak, V. Nazabal, B. Bureau, J. Oelgoetz, A. Kovalskiy, et al.. Chemical order in Ga or Sb modified germanium sulfide glasses around stoichiometry High-resolution XPS and Raman studies. Journal of Non-Crystalline Solids, Elsevier, 2018, 499, pp.237-244. ⟨10.1016/j.jnoncrysol.2018.07.040⟩. ⟨hal-01874720⟩

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