Abstract
The new tetrabutylphosphonium tetrachloroantimonate (III) crystal has been grown by the solvent evaporation method. It crystallizes at room temperature in the monoclinic system (P21/n space group) with the following unit cell parameters: a = 10.535 A (3), b = 18.796 A (6), c = 12.743 A (4), β = 94.39 (2)°, and Z = 4. The atomic arrangement of the title compound is composed by [(C4H9)4P]+ cations which form infinite chains along [100] direction. Two anionic groups connected by edges [Sb2Cl8]2− are intercalated in the octahedral cavities between six organic groups. The thermal analysis (DSC) studies indicate the presence of one order–disorder phase transition located at 338 K. Moreover, the electrical properties were performed in the frequency range 200 Hz–5 MHz and temperature interval from 313 to 353 K using impedance spectroscopy. Nyquist plots (−Z″ versus Z′) revealed the presence of two contributions at different temperatures associated with grain and grain boundaries. The equivalent circuit is formed by a series combination of two (Rg–C) and (Rgb–CPE) parallel. The frequency dependence of σac(ω) well described the Jonscher’s power (σac(ω) = σdc + Aωs). In addition, the temperature dependence study of frequency exponent (S) is investigated to explain the conduction mechanism, which is attributed to the barrier hopping (CBH) model in the region I and II.
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