Electric and dielectric studies of the [N(CH3)3H]2CuCl4 compound at low temperature

The [N(CH3)3H]2CuCl4 single crystal has been analyzed by X-ray powder diffraction patterns, differential scanning calorimetry (DSC), and electrical impedance spectroscopy. [N(CH3)3H]2CuCl4 crystallizes at room temperature in the monoclinic system with P21/C space group. Three phase transitions at T1 = 226 K, T2 = 264 K, and T3 = 297 K have been evidenced by DSC measurements. The electrical technique was measured in the 10−1–107 Hz frequency range and 203–313 K temperature intervals. The frequency dependence of alternative current (AC) conductivity is interpreted in terms of Jonscher's law (developed). The AC electrical conduction in [N(CH3)3H]2CuCl4 compound is studied by two processes which can be attributed to a hopping transport mechanism: the correlated barrier hopping model in phases I, II, and III, the non-overlapping small polaron tunneling model in phase IV. The conduction mechanism is interpreted with the help of Elliot's theory, and the Elliot's parameters are found.

Alternative current conduction mechanisms of organic-inorganic compound [N(CH3)3H]2CuCl4

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 ) .

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

Electrical properties and conduction mechanism of [C2H5NH3]2CuCl4 compound

Structural characterization, vibrational spectroscopy accomplished with DFT calculation, thermal and dielectric behaviors in a new organic-inorganic tertrapropylammonium aquapentachlorostannate dihydrate compound

J.L. Moneger

Papers

Characterization of phase transitions of [N(CH3)4]2ZnCl2Br2 mixed crystals