AC conductivity and Dielectric Study of Chalcogenide Glasses of Se-Te-Ge System

Authors : Fathy SALMAN

Pages : 41-48

Doi:10.3906/sag-1205-120

View : 22 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The ac conductivity and dielectric properties of glassy system SexTe79 - xGe21, with x = 11, 14, 17 at.%, has been studied at temperatures 300 to 450 K and over a wide range of frequencies insert ignore into journalissuearticles values(50 Hz to 500 kHz);. Experimental results indicate that the ac conductivity and the dielectric constants depend on temperature, frequency and Se content. The conductivity as a function of frequency exhibited two components: dc conductivity s dc, and ac conductivity s ac, where s ac \sim w s. The mechanism of ac conductivity can be reasonably interpreted in terms of the correlated barrier hopping model insert ignore into journalissuearticles values(CBH);. The activation energies are estimated and discussed. The dependence of ac conductivity and dielectric constants on the Se content x can be interpreted as the effect of Se fraction on the positional disorder. The impedance plot at each temperature appeared as a semicircle passes through the origin. Each semicircle is represented by an equivalent circuit of parallel resistance Rb and capacitance Cb.
Keywords : Turk J Phys, 28, 2004, 41 48 Turk J Phys, vol 28, iss 1