Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5441191 | Journal of Non-Crystalline Solids | 2017 | 8 Pages |
Abstract
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 SS and SeS are centered at 2.2(5)Â Ã
, while the AsS and SeSe are centered at 2.35Â Ã
, the AsAs and AsSe are centered at 2.4(5)Â Ã
. 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 SeSe bonds. It has been identified that the replacement of Se with S atoms causes a slight change in coordination numbers. The similarity of θSeAsSe and θAsSeAs 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
R.I. Alekberov, S.I. Mekhtiyeva, A.I. Isayev, M. Fábián,