Electrical properties, phase transitions and conduction mechanisms of the [(C2H5)NH3]2CdCl4 compound

The [(C 2 H 5 )NH 3 ] 2 CdCl 4 hybrid material was prepared and its calorimetric study and electric properties were investigated at low temperature. The X-ray powder diffractogram has shown that the compound is crystallized in the orthorhombic system with Abma space group, and the refined unit cell parameters are a =7.546 A, b =7.443 A, and c =21.831 A. The calorimetric study has revealed two endothermic peaks at 216 K and 357 K, which are confirmed by the variation of f p and σ dc as a function of temperature. The equivalent circuit based on the Z-View-software was proposed and the conduction mechanisms were determined. The obtained results have been discussed in terms of the correlated barrier hopping model (CBH) in phase I (low temperature (OLT)), non-overlapping small polaron tunneling model (NSPT) in phase II (room temperature (ORT)) and the overlapping large polaron tunneling model in phase III (high temperature (OHT)). The density of localized states N F ( E ) at the Fermi level and the binding energy W m were calculated. The variation of the dielectric loss log( e ʺ) with log( ω ) was found to follow the empirical law, e ″= B ω m ( T ) .