Publication :
Atomic level structure of Ge-Sb-S glasses : chemical short range order and long Sb-S bonds

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Date
2018-09-28
Auteurs
Pethes, Ildikó
Nazabal, Virginie
Kaban, Ivan
Darpentigny, Jacques
Welter, Edmund
Gutowski, Olof
Bureau, Bruno
Jóvári, Pál
Direction de publication
Direction de recherche
Titre de la revue
ISSN de la revue
Titre du volume
Éditeur
Elsevier Science
Projets de recherche
Structures organisationnelles
Numéro de revue
Résumé
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 Å longer bond distance than the usually accepted covalent bond length (~2.45 Å). From this observation it was inferred that a part of Sb atoms have more than 3 S neighbors.
Description
Revue
Journal of alloys and compounds, Vol. 774, 1009-1016 (2019)
DOI
10.1016/j.jallcom.2018.09.334
URL vers la version publiée
Mots-clés
Chalcogenide glasses , Ge-Sb-S , Structure , Diffraction , EXAFS , RMC
Citation
Type de document
article de recherche