Investigation of structural and ionic conductivity in the new organic-inorganic bromide:[(C3H7)4P]2Cd2Br6

The organic-inorganic compounds with alkylphosphonium groups were employed in many fields of applications as reported in various studies. Furthermore, these materials had shown diverse transitions depending on the preparation process. In this paper, a novel organic-inorganic hybrid [(C3H7)4P]2Cd2Br6, has been synthesized and characterized by single crystal X-ray diffraction, differential scanning calorimetry and complex impedance spectroscopy measurement. The crystal structure refinement shows that the crystallization of the [(C3H7)4P]2Cd2Br6 compound was achieved in the Triclinic system (P-1: space group, Ci: Schoenflies's nomenclature) with the following unit cell dimensions: a ​= ​13.662 (3) Å, b ​= ​16.146 (4)Å, c ​= ​16.857(4) Å, α ​= ​114.867 (6)°, β ​= ​91.650 (8)°, γ ​= ​114.357 (7)°and Z ​= ​3.The differential scanning calorimetry (DSC) analysis shows an endothermic peak at 364 ​K upon heating which attributed to a structural phase transition. The study of the AC conductivity and the dielectric properties confirm the existence of the phase transition. Complex impedance spectroscopic analysis indicated both, the presence of bulk contribution and non-Debye type in the material. The bulk resistance decreases with increasing temperature indicating a typical semiconductor behavior. The thermal evolution of the conductivity is found to obey the Arrhenius law with activation energies, 0.55 ​eV in region I and 0.78 ​eV in region II.