Stoichiometric deviations in bond distances in the mixed As2S3-As2Se3 system: Raman spectroscopy and EXAFS studies
Source abstract
Abstract
Abstract Raman spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy have been applied to find evidence for isostructural substitution of chalcogen atoms in pyramidal structural units of network glasses from stoichiometric/pseudo-binary As 2 S 3 -As 2 Se 3 system. The obtained values of the nearest neighbours atomic distance (r As-Se = 2.37 ± 0.01 A; r As-S = 2.33 ± 0.01 A for As 40 Se 30 S 30 ) suggest the existence of mixed AsS 2 Se and AsSe 2 S pyramids in which each of As atoms is bonded with S and/or Se atoms in relation to S/Se ratio in composition, while Se atoms are bonded only with As ones with the same bond distance in the form of = As-Se-As = bridges that connect the main pyramidal structural units. No evidence for existence of heteroatomic or heteronuclear Se S bonding is found for the examined glasses.
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Research context
OpenAlex topics: Phase-change materials and chalcogenides · Glass properties and applications · Crystal Structures and Properties
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