| Abstract: | The X‐ray diffraction and Infrared (IR) spectral studies of (NH4)2 CuCl4.2H2O single crystals reveals that these crystals contains tetragonal crystal structure with the unit cell dimensions of a = 7.58Å, c = 7.95Å, z= 2, β =90° and two water molecules in the unit cell. The temperature dependence of thermally stimulated depolarization current (TSDC) and dc electrical conductivity (σ) studies of this two‐dimensional (NH4)2 CuCl4.2H2O single crystal have been carried out in 77K–300K temperature region. The TSDC thermograph shows only one sharp peak at 248K with a peak current of 130nA, which is attributed to the Maxwell‐Wagner peak. The activation energy (U), relaxation time (τ) are calculated as 0.78eV and 3.44×10‐15 s respectively. Dc electrical conductivity studies of these crystals show a first order phase transition at about 248K. |
