Abstract
129I-Mossbauer 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-Mossbauer spectra of all glasses were fitted satisfactory, when a distribution of the electric-quadrupole coupling constant is taken into account.
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