Details
| Original language | English |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 284 |
| Issue number | 1-3 |
| Publication status | Published - 22 May 2001 |
| Externally published | Yes |
Abstract
Insights into the structure and dynamics of the binary As-Se glass system have been obtained from high-temperature 77Se 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 AsSe3/2 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 AsSe3/2 and Se2/2 groups are randomly linked.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Materials Chemistry
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In: Journal of Non-Crystalline Solids, Vol. 284, No. 1-3, 22.05.2001, p. 1-8.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Structural organization of arsenic selenide liquids
T2 - New results from liquid state NMR
AU - Rosenhahn, Carsten
AU - Hayes, Sophia E.
AU - Rosenhahn, Bodo
AU - Eckert, Hellmut
N1 - Funding information: Financial support of this research by the U.S. National Science Foundation (DMR 92-21197) and the Deutsche Forschungsgemeinschaft is most gratefully acknowledged. C.R. acknowledges support by the Verband der Chemischen Industrie, Stiftung Stipendien Fonds.
PY - 2001/5/22
Y1 - 2001/5/22
N2 - Insights into the structure and dynamics of the binary As-Se glass system have been obtained from high-temperature 77Se 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 AsSe3/2 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 AsSe3/2 and Se2/2 groups are randomly linked.
AB - Insights into the structure and dynamics of the binary As-Se glass system have been obtained from high-temperature 77Se 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 AsSe3/2 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 AsSe3/2 and Se2/2 groups are randomly linked.
UR - http://www.scopus.com/inward/record.url?scp=0035338385&partnerID=8YFLogxK
U2 - 10.1016/S0022-3093(01)00371-4
DO - 10.1016/S0022-3093(01)00371-4
M3 - Article
AN - SCOPUS:0035338385
VL - 284
SP - 1
EP - 8
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
IS - 1-3
ER -