Abstract

1
Compositional dependence of the electrical
conductivity in silver containing chalcogenide
glasses
V. Ilcheva1,2, P. Petkov1, I. Kanazirski3, E.
Lefterova2,T. Petkova2
1 University of Chemical Technology and
Metallurgy, Department of Physics, Sofia,
Bulgaria 2 Institute of Electrochemistry and
Energy Systems, Bulgarian Academy of Sciences,
Sofia, Bulgaria 3 University of Mining and
Geology St. Ivan Rilski 1700 Sofia,
Bulgaria e-mail vania_ilcheva_at_yahoo.com

Abstract We present the results from
conductivity measurements of three different
compositions in the chalcogenide glassy system
As-Se-Ag. The aim of this work is to study the
influence of the Ag addition on the conductivity
of the system as a result of modification of the
glass structure. (AsSe)100-xAgx glasses (x 15,
20, 25 mol ) were prepared by melt-quenched
technique. Impedance Spectroscopy Method was
applied to determine the electrical conductivity
of the glasses. The measurements were performed
in the frequency range 1 Hz to 1 MHz at different
temperature. The compositional dependence of the
glass conductivity was investigated and discussed.
EXPERIMENTAL RESULTS

• Compositions
• (AsSe)85Ag15
• (AsSe)80Ag20
• (AsSe)75Ag25

Impedance spectra of the of (AsSe)80Ag20 glasses
at different temperatures
Impedance spectra of the of (AsSe)100-xAgx
glasses at T 20C
Composition Conductivity (20C) S.cm-1 Ea eV
(AsSe)85Ag15 3.2x10-5 0.64
(AsSe)80Ag20 7.8x10-4 0.29
(AsSe)75Ag25 3.0x10-4 0.53
XRD spectra of (AsSe)100-xAgx glasses
Arrhenius plot for (AsSe)100-xAgx glasses
SUMMARY
Chalcogenide glasses (AsSe)100-xAgx in the
compositional region of x 15 25 were prepared
and characterized. The experimental impedance
data were analyzed and the bulk conductivity was
estimated, using two different models. The
conductivity is found to increase with increasing
silver content and temperature. This is
probably due to modification of the glass
structure as a result of formation of AgSe,
improving the ionic conductivity of the
material. The results show higher values of the
conductivity and lower activation energies,
compared to our previous investigations in the
As-Se system, containing AgI.
Acknowledgment The authors are grateful for the
final support of European Social Fund, Human
Resources Development Programme, under the
contract BG 051PO001-3.3.06-0014