Abstract
This article reports the effect of Ag impurity (low ~4 and ~6 at.% and high ~10 at.%) on the ac conductivity (σac) of a-Ge20Se80 glass. Frequency (ω)-dependent ac conductance and capacitance of the samples over a frequency range ~100 Hz to 50 kHz was taken in the temperature range ~268–358 K. At frequency 2 kHz and temperature 298 K, the value of σac increases at low as well as at higher concentration of Ag. The σac is proportional to ωs for undoped and doped samples. The value of frequency exponent (s) decreases as the temperature increases.
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