The structure and optical properties of GeO2-GeS2 glasses

Nobuaki Terakado, Keiji Tanaka

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Oxy-chalcogenide glasses with compositions of xGeO2-(100 - x)GeS2, where 0 ≤ x ≤ 100 mol%, have been prepared and studied in terms of their structures and optical properties. X-ray fluorescence spectroscopy shows that Ge:S ratio can deviate from GeS2 by ∼10 at.%, depending critically upon the preparation conditions. Raman scattering spectroscopy suggests that stoichiometric GeO2-GeS2 glasses have a heterogeneous structure in the scale of 1-100 nm. The optical gaps are nearly constant at 3.0-3.5 eV for glasses with 0 ≤ x ≤ 80 mol% and abruptly increase to ∼6 eV in GeO2. This dependence suggests that the optical gap is governed by GeS2 clusters, which are isolated and/or percolated. Composition-deviated glasses appear as orange and brown, and these glasses seem to have more inhomogeneous structures.

Original languageEnglish
Pages (from-to)1992-1999
Number of pages8
JournalJournal of Non-Crystalline Solids
Issue number18
Publication statusPublished - 2008 Apr 15


  • Chalcogenides
  • Composition
  • Fluctuations
  • Germania
  • Glass transition
  • Medium-range order
  • Optical spectroscopy
  • Raman scattering
  • Raman spectroscopy
  • Short-range order
  • X-ray diffraction


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