Nanocomposites and nanomaterials

FTIR spectra of 80GeS2-20Ga2S3-CsCl glasses
H. Klym1, I. Karbovnyk2, M. Cestelli Guidi3,
O. Shpotyuk4,5, L. Calvez6, A.I. Popov7
1 Lviv Polytechnic National University, 12, Bandery Str., Lviv, 79013, Ukraine 
E-mail: halyna.i.klym@lpnu.ua; klymha@yahoo.com 
2 Department of Electronics and Computer Technologies, Ivan Franko National University of Lviv, 107, Tarnavskogo Str., Lviv, 79000, Ukraine
3 INFN_Laboratori Nazionali di Frascati, Via E. Fermi 40, Frascati, 00044, Italy
4 Vlokh Institute of Physical Optics, 23, Dragomanova Str., Lviv, 79005, Ukraine
5 Jan Dlugosz University in Czestochowa, 
13/15, Armii Krajowej Str., 42200, Czestochowa, Poland
6 Equipe Verres et et Céramiques, UMR-CNRS 6226, Institute des Sciences chimiques de Rennes, Université de Rennes 1, 35042 Rennes Cedex, France
7 Institute for Solid State Physics, University of Latvia, 
Kengaraga 8, Riga, 1063 Latvia

In this work the FTIR spectra of (80GeS2-20Ga2S3)100(СsCl)0, (80GeS2-20Ga2S3)95(СsCl)5, (80GeS2-20Ga2S3)90(СsCl)10 and (80GeS2-20Ga2S3)85(СsCl)15 glasses were investigated using a Vertex 70V FTIR spectrometer equipped with a Janis ST-100-FTIR. It is shown that sharp peak at 4000 nm for base (CsCl)0 glass is attributed to S-H stretching and is considerably damped for samples with CsCl in mid-IR spectra. There are also features at 6300 nm corresponding to H2O, 6700 nm and 2900 nm related to O-H strectching vibrations. It is established that for each measured temperature (77 K, 150 K, 220 K and 293 K), the intensities of the observed vibrational bands increase with CsCl amount in 80GeS2-20Ga2S3 glasses. Principal vibrational bands centered near 1100 cm-1  1580 cm-1, 2500 cm-1  and 3700 cm-1 in (CsCl)15 glasses are slightly shifted to lower energies between 77 and 150 K. The shift is more pronounced between 220 and 293 K. Temperature dependences of FTIR spectra also indicate the lower-energy shift of vibrational frequency of S-H related band for (CsCl)15 glasses and the shift of O-H related peaks at elevating temperatures.

FTIR experiments at INFN-LNF were supported by CALIPSO Plus program.