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

The complex impedance of the compound [N(CH3)4]2Cu0.5Zn0.5Cl4 have been investigated in the temperature range 443–532K and in the frequency range 200Hz–5MHz. Dielectric data were analyzed using complex permittivity ɛ* 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 ϕ(t) = exp(−t/τ)β. The frequency dependence of the conductivity is interpreted in term of Jonschers law: σ(ω) = σDC + Aωn. 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 Rp and constant phase elements CPE.