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- W2028908043 endingPage "335105" @default.
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- W2028908043 abstract "A combination of neutron and x-ray diffraction has been employed to study the compositional dependence of the atomic structures of GexAsxS100−2x glasses with S concentration varying between 33.3 and 70.0 at.%. The nearest-neighbor coordination numbers of Ge and As atoms are always found to be 4 and 3, respectively, irrespective of the glass composition. Ge and As atoms have primarily heteropolar bonding to S atoms in stoichiometric and S-excess glasses with x≤18.2. Low and intermediate levels of deficiency of S (20≤x≤25) are accommodated via the formation of homopolar As–As bonds while Ge atoms remain primarily bonded to four S atoms, resulting in As-rich regions in the glass structure. Ge starts to participate in metal–metal bonding only in the highly S-deficient glasses with 27.5≤x≤33.3. The intermediate-range order and its topological influence on atomic packing in these three compositional regions, in the order of increasing deficiency in S, are controlled by (a) a mixed GeS2 and As2S3 network, (b) the coexistence of a GeS2 network and As clusters, and (c) large Ge–As metal-rich regions. This evolution of the intermediate-range structure with composition is consistent with the corresponding variation of the position, intensity and width of the first sharp diffraction peak in the structure factor." @default.
- W2028908043 created "2016-06-24" @default.
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- W2028908043 date "2008-07-22" @default.
- W2028908043 modified "2023-09-25" @default.
- W2028908043 title "A combined neutron and x-ray diffraction study of short- and intermediate-range structural characteristics of Ge–As sulfide glasses" @default.
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- W2028908043 doi "https://doi.org/10.1088/0953-8984/20/33/335105" @default.
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