Abstract
Insights into the structure and dynamics of the binary As–Se glass system have been obtained from high-temperature 77 Se nuclear magnetic resonance (NMR) studies of molten samples. In materials having As contents <20 at.%, dynamic exchange averaging processes are detected and analysed quantitatively by detailed lineshape simulations. At high-temperatures ( 1.5× glass transition temperature), only a single averaged 77Se NMR signal is observed, whose chemical shift arises from the quantitative distribution of As–Se and Se–Se bonds. A detailed analysis of the compositional dependence reveals a tendency towards chemical ordering, based on the structurally dominant AsSe 3/2 groups. Furthermore, the experimental data serve to differentiate between various intermediate range ordering scenarios and favor a structural description in terms of a network in which AsSe 3/2 and Se 2/2 groups are randomly linked.
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