Dielectric relaxation and ionic conductivity studies of [N(CH3)4]2Cu0.5Zn0.5Cl4

The complex impedance of the compound [N(CH3)(4)](2)Cu0.5Zn0.5Cl4 have been investigated in the temperature range 443-532K and in the frequency range 200Hz-5MHz. Dielectric data were analyzed using complex permittivity epsilon* and complex electrical modulus M* for the sample at various temperatures. The modulus plot can be characterized by full width at half height or in terms of a non-experiential decay function phi(t) = exp(-t/tau)(beta). The frequency dependence of the conductivity is interpreted in term of Jonschers law: sigma(omega) = sigma(DC) +A omega(n). The conductivity follows the Arrhenius relation. Hopping frequency was determined and activation energy of hopping is almost equal to the activation energy of conduction. The Z' and Z '' versus frequency plots are well fitted to an equivalent circuit model. The circuits consist of the parallel combination of bulk resistance R-p and constant phase elements CPE. (C) 2007 Elsevier B.V. All rights reserved.