Transcript Slide 1

Structural and conductivity studies of Ge-S-AgI glasses
B. Monchev1, T. Petkova1, P. Petkov2 and I. Kanazirski3
1 Institute
of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia, Bulgaria
Corresponding author: [email protected]
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
 The structure of the amorphous materials with compositions (GeSx)100-yAgIy 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.
FTIR analysis
XRD
Conductivity
Observed IR Bands
Literature IR Bands
Region 100-200
109 – 110
Molar Volume
Number density
Ea
Composition
cm-1
148-151 cm-1
105-110 cm-1 = Ag+ ions [2,4]
110 cm-1 = υ2(E)GeS4/2 [2]
100-110 cm-1 = AgI [9]
[ m3/mol]
x1028 [atoms/m3]
[eV]
185 – 188
cm-1
147-153 cm-1 = υ4(F2)GeS4/2 [2,5,7]
180-190 cm-1 = Ag2S [7,9]
(GeS1,2)90(AgI)10
1,78
3,38
0,31
Region 200-300
232 – 240 cm-1
230-240 cm-1 = Ag2S [9]
251 cm-1 = Ge-S-I linkages [1]
259 cm-1
(GeS1,2)80(AgI)20
1,97
3,06
255-260 cm-1 = S3Ge-GeS3 [3,4]
0,27
275 – 279 cm-1
270 cm-1 = meta(Ge-S-Ge) [2]
Region 300-400
(GeS1,5)90(AgI)10
1,80
3,35
0,29
306 – 313 cm-1
336 – 339 cm-1
378 – 379 cm-1
(GeS1,5)80(AgI)20
2,19
2,75
0,43
328-327 cm-1 = υ1(A1)GeS4/2 [2,3,5]
377-380 cm-1 = υ3(F2)GeS4/2 [2,3]
360-380 cm -1 = GeS1/2S33- [4]
Region 400-500
412 – 417 cm-1
405 cm-1 = Ge-S-I linkages [1]
Conclusions
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.
 The basic structural units detected are GeS4/2 tetrahedra, S3-Ge-Ge-S3 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.