I-129 MOSSBAUER SPECTROSCOPIC STUDY OF IODIDE-CONTAINING CHALCOGENIDE GLASSES

129I-Mössbauer spectroscopy was used to study the short-range order in I-containing chalcogenide glasses. It was found that AsXI glasses, where X=S or Se, are molecular solids composed from molecular units of arsenic iodide and arsenic chalcogenide. The local environment of iodide ions in ternary superionic conducting glasses AgI-Ag2S-As2S3 is similar to that in the crystalline superionic conductor Ag3SI and differs distinctly from iodide local order in binary vitreous alloys AgI-As2S3 and crystalline AgI.129I-Mössbauer spectra of all glasses were fitted satisfactory, when a distribution of the electric-quadrupole coupling constant is taken into account. © 1990 J.C. Baltzer A.G. Scientific Publishing Company.