Dielectric and impedance spectral characteristics of bulk ZnIn2Se4

G.F.Salem ; M.M. El-Nahass ; A.A. Attia ; H.A.M. Ali 


Abstract


The frequency and temperature dependence of ac conductivity, dielectric constant and dielectric loss of ZnIn 2 Se 4 in a pellet form were investigated in the frequency range of 10 2 -10 6 Hz and temperature range of 293-356 K. The behavior of ac conductivity was interpreted by the correlated barrier hopping (CBH) model. Temperature dependence of ac conductivity indicates that ac conduction is a thermally activated process. The density of localized states N(E F ) and ac activation energy were estimated for various frequencies. Dielectric constant and dielectric loss showed a decrease with increasing frequency and an increase with increasing in temperature. The frequency dependence of real and imaginary parts of the complex impedance was investigated. The relaxation time decreases with the increase in temperature. The impedance spectrum exhibits the appearance of the single semicircular arc. The radius of semicircular arcs decreases with increasing temperature which suggests a mechanism of temperature-dependent on relaxation. © 2013 Elsevier B.V. All rights reserved.


Other data

Keywords Dielectric properties- Impedance spectrum- Electrical conductivity
Issue Date 1-Jan-2014
Journal Physica B: Condensed Matter 
Series/Report no. ;89-94
URI http://api.elsevier.com/content/abstract/scopus_id/84888187174
http://research.asu.edu.eg/123456789/559
DOI 10.1016/j.physb.2013.10.049


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