Atomic level structure of Ge-Sb-S glasses: Chemical short range order and long Sb-S bonds
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Datum publikování
2019
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Elsevier Science SA
Abstrakt
The structure of Ge20Sb10S70, Ge23Sb12S65 and Ge26Sb13S61 glasses was investigated by neutron diffraction (ND), X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS) measurements at the Ge and Sb K-edges as well as Raman scattering. For each composition, large scale structural models were obtained by fitting simultaneously diffraction and EXAFS data sets in the framework of the reverse Monte Carlo (RMC) simulation technique. Ge and S atoms have 4 and 2 nearest neighbors, respectively. The structure of these glasses can be described by the chemically ordered network model: Ge-S and Sb-S bonds are always preferred. These two bond types adequately describe the structure of the stoichiometric glass while S-S bonds can also be found in the S-rich composition. Raman scattering data show the presence of Ge-Ge, Ge-Sb and Sb-Sb bonds in the S-deficient glass but only Ge-Sb bonds are needed to fit diffraction and EXAFS datasets. A significant part of the Sb-S pairs has 0.3-0.4 angstrom longer bond distance than the usually accepted covalent bond length (similar to 2.45 angstrom). From this observation it was inferred that a part of Sb atoms have more than 3 S neighbors.
Rozsah stran
p. 1009-1016
ISSN
0925-8388
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Projekt
GA16-17921S/Heterostruktury založené na chalkogenidech pro nelineární optiku a optické senzory
Zdrojový dokument
Journal of Alloys and Compounds, volume 774, issue: February
Vydavatelská verze
https://www.sciencedirect.com/science/article/pii/S0925838818335928
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open access (CC BY-NC-ND 4.0)
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chalcogenide glasses, Ge-Sb-S, structure, diffraction, EXAFS, chakogenidová skla, Ge-Sb-S, struktura, difrakce, EXAFS
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Except where otherwised noted, this item's license is described as open access (CC BY-NC-ND 4.0)