The local structure of As Se S chalcogenide glasses studied by neutron diffraction and Raman scattering
| Autor: | S. I. Mekhtiyeva, A. I. Isayev, Margit Fábián, R. I. Alekberov |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Chalcogenide Coordination number Neutron diffraction Chalcogenide glass 02 engineering and technology Reverse Monte Carlo Neutron scattering 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials symbols.namesake Crystallography chemistry.chemical_compound Molecular geometry chemistry 0103 physical sciences Materials Chemistry Ceramics and Composites symbols 0210 nano-technology Raman scattering |
| Zdroj: | Journal of Non-Crystalline Solids. 470:152-159 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2017.05.015 |
| Popis: | The local structures of amorphous As40Se60, As40Se30S30, As33.3Se33.3S33.4 chalcogenide glass semiconductors have been studied by neutron diffraction and Raman scattering methods. The neutron diffraction data-sets were modeled by Reverse Monte Carlo (RMC) simulation technique. Several first and second neighbour distances, coordination numbers and bond-angle distributions have been calculated. It is established that the first neighbour atomic distances are overlapping at three characteristic distances, namely the S S and Se S are centered at 2.2(5) A, while the As S and Se Se are centered at 2.35 A, the As As and As Se are centered at 2.4(5) A. The average coordination numbers in As40Se60 (ZAs = 3.03; ZSe = 2.02) and As40Se30S30 (ZAs = 3; ZSe = 2.07; ZS = 2) compositions were determined and found to be consistent with, “8-N” rule. The slight deviations from this rule is discovered in case of As33.3Se33.3S33.4 (ZAs = 3.07; ZSe = 2.09; ZS = 1.95) composition. The main role in the formation of medium range order belongs to Se Se bonds. It has been identified that the replacement of Se with S atoms causes a slight change in coordination numbers. The similarity of θSe As Se and θAs Se As bond angle distributions suggest that S atoms have a similar role in the structure formation as Se atoms. The RMC models highlighted a glassy network built-up from AsSe3 trigonal bipyramids, in all binary and ternary samples. |
| Databáze: | OpenAIRE |
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