Nanocomposites and nanomaterials

Structural properties of As-Se-S and As-S-Sb chalcogenide glasses
Revutska L.O.1, Shportko K.V.2, Stronski A.V.2, Baran J.3, Gudymenko O.Y.2, Oleksenko P.F.2, Venger E.F2
1 National Technical University of Ukraine “Igor Sikorsky KPI”.
 Prospect Peremohi, 37, Kyiv-03055, Ukraine. 
E-mail: liubov.revutska@gmail.com
2 V. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine.
Prospect Nauki, 41, Kyiv-03039, Ukraine. 
3 Institute of low temperatures and structure research, PAS.
Wroclaw, Poland.

Chalcogenide glasses (CG) are typical representatives of non-oxide glasses. CG are very promising materials for using in optoelectronics as high-speed optical elements, for applications such as data processing devices, electronic switches and optical elements [1]. They are transparent in the VIS and the IR regions. 
The aim of this study is to perform analysis of the compositional evolution of Raman spectra and parameters of short-range order of the As-Sb-S and As-S-Se amorphous chalcogenide alloys. The experimental XRD profiles confirm the amorphous nature of studied CG. 
The Raman spectra of As-Sb-S samples exhibit main bands around at 340 cm-1 and at 315 cm-1, and a wide band structure around 150 cm-1. Observed bands in the Raman spectra of As-Sb-S samples can be explained in the terms of vibrational modes As2S3 and Sb2S3 glasses. The Raman spectra of As-Se-S samples exhibit two main bands at around 230 cm-1 and at 340 cm-1, and a wide band structure around 150 cm-1. Observed bands in the Raman spectra of As-Se-S samples can be explained in the terms of As2Se3 and As2S3 glasses vibrational modes. The Gaussian decomposition of obtained Raman spectra was performed for a quantitative analysis of their compositional dependencies. 
Thus, Raman data show that As–Sb–S and As-Se-S glasses contain different nanophases whose concentration is changing along chosen compositional cross-section and calculated radial distribution functions show the changing of elements concentration doesn’t significantly affect the first coordination sphere.

1.	Stronski A.V., Vlcek M., Stetsun A.I., Sklenar A., Shepeliavyi P.E.. Raman spectra of Ag- and Cu-photo-doped As40S60-xSex films // J. Non-Cryst. Solids.- 2000. -270. P. 129–136.