Abstract
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.
| ???language??? | English |
|---|---|
| ???pages??? | 1009-1016 |
| ???numberOfPages??? | 8 |
| ???journalAssociation??? | Journal of Alloys and Compounds |
| ???volume??? | 774 |
| ???DOIs??? | |
| ???publicationStatus??? | Published - febr. 5 2019 |
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Keywords
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
Cite this
Atomic level structure of Ge-Sb-S glasses : Chemical short range order and long Sb-S bonds. / Pethes, I.; Nazabal, V.; Ari, J.; Kaban, I.; Darpentigny, J.; Welter, E.; Gutowski, O.; Bureau, B.; Messaddeq, Y.; Jóvári, P.
???in???: Journal of Alloys and Compounds, ???journal.volume??? 774, 05.02.2019, ???pages??? 1009-1016.???family-name???: Article
}
TY - JOUR
T1 - Atomic level structure of Ge-Sb-S glasses
T2 - Journal of Alloys and Compounds
AU - Pethes, I.
AU - Nazabal, V.
AU - Ari, J.
AU - Kaban, I.
AU - Darpentigny, J.
AU - Welter, E.
AU - Gutowski, O.
AU - Bureau, B.
AU - Messaddeq, Y.
AU - Jóvári, P.
PY - 2019/2/5
Y1 - 2019/2/5
N2 - 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.
AB - 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.
KW - Chalcogenide glasses
KW - Diffraction
KW - EXAFS
KW - Ge-Sb-S
KW - RMC
KW - Structure
UR - http://www.scopus.com/inward/record.url?scp=85054860016&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85054860016&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2018.09.334
DO - 10.1016/j.jallcom.2018.09.334
M3 - Article
VL - 774
SP - 1009
EP - 1016
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -