1.  The structure of the amorphous materials with compositions (GeS x ) 100-y AgI y with x= 1,2 ; 1,5 and y = 5, 10, 15, 20 mol.% has been studied by IR spectroscopy with respect to their application.  Interesting conductivity results in Ge-S-AgI non-crystalline materials has been detected. Structural and conductivity studies of Ge-S-AgI glasses Structural and conductivity studies of Ge-S-AgI glasses B. Monchev 1, T. Petkova 1, P. Petkov 2 and I. Kanazirski 3 Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia, Bulgaria 1 Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia, Bulgaria Corresponding author: boris_monchev@yahoo.com 2 Laboratory of Thin Film Technology, University of Chemical Technology and Metallurgy-Sofia, Bulgaria 3 Department of Physic-chemistry, University of Chemical Technology and Metallurgy-Sofia, Bulgaria FTIR analysis Structural units Conclusions The basic structural units detected are GeS 4/2 tetrahedra, S 3 -Ge-Ge-S 3 formations and Ge-S-I linkages ! Some vibrations on the spectra have been attributed to silver-iodine and silver-sulfur interactions in complex silver-chalcogenide fragments ! Silver-based formations are most probable reason for the registered broad bands as revealed peaks fitting ! Conductivity depends on the temperature and composition of the studied Ge-S-AgI materials ! Acknowledgment: The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement № 213389. XRD References [1] J. Heo, J. Mackenzie, J. Non-Cryst. Sol. 113 (1989) 246. [2] E. Kamitsos, J. Kapoustis, G. Chryssikos, A. Pradel, M. Ribes, J. Sol. State Chem. 112 (2) (1994) 255. [3] C. Julien, S. Barnier, M. Massot, N. Chbani, X. Cai, A.M. Loireau-Lozac’h, M. Guittard, Materials Science and Eingineering B 22 (1994) 191. [4] Q. Mei, J. Saienga, J. Schrooten, B. Meyer, S. Martin, J. Non-Cryst. Sol. 324 (2003) 264. [5] G. Lukovsky, F.Galeener, R. Keezer, R. Geils, H. Six, Phys. Rev. B 9 (1974) 1591. [6] A. Ibanez, E. Philippot, S. Benazeth, H. Dexpert, J. Non-Cryst. Sol. 127 (1991) 25. [7] A. Stetsun, I. Indutnyi, V. Kravets, J. Non-Cryst. Sol. 202 (1996), 113. [8] I. Kotsalas, C. Raptis, J. Optelect. Adv. Mater. 3 (3) (2001) 675. [9] Gmelin L. (1974–1979) In: Gmelin handbook of inorganic chemistry. Springer-Verlag. [10] R. Holomb, P. Johansson, V. Mitsa, I. Rosola, Philosophical Magazine 85 (25) (2005) 2947. Observed IR BandsLiterature IR Bands Region 100-200 109 – 110 cm -1 148-151 cm -1 185 – 188 cm -1 105-110 cm -1 = Ag + ions [2,4] 110 cm -1 = υ 2 (E)GeS 4/2 [2] 100-110 cm -1 = AgI [9] 147-153 cm -1 = υ 4 (F 2 )GeS 4/2 [2,5,7] 180-190 cm -1 = Ag 2 S [7,9] Region 200-300 232 – 240 cm -1 259 cm -1 275 – 279 cm -1 230-240 cm -1 = Ag 2 S [9] 251 cm -1 = Ge-S-I linkages [1] 255-260 cm -1 = S 3 Ge-GeS 3 [3,4] 270 cm -1 = meta(Ge-S-Ge) [2] Region 300-400 306 – 313 cm -1 336 – 339 cm -1 378 – 379 cm -1 328-327 cm -1 = υ 1 (A 1 )GeS 4/2 [2,3,5] 377-380 cm -1 = υ 3 (F 2 )GeS 4/2 [2,3] 360-380 cm -1 = GeS 1/2 S 3 3- [4] Region 400-500 412 – 417 cm -1 405 cm -1 = Ge-S-I linkages [1] Motivation Conductivity Composition Molar Volume [ m 3 /mol] Number density x10 28 [atoms/m 3 ] E a [eV] (GeS 1,2 ) 90 (AgI) 10 1,783,380,31 (GeS 1,2 ) 80 (AgI) 20 1,973,060,27 (GeS 1,5 ) 90 (AgI) 10 1,803,350,29 (GeS 1,5 ) 80 (AgI) 20 2,192,750,43