Abstract
The dielectric and the conduction characteristics of (C6H20N3)BiCl6·H2O from room temperature (290 K) to 355 K have been investigated by using impedance spectroscopy. The temperature-dependent conductivity and the relaxation times show a break in both the conductivity and the relaxation time around 335 K corresponding to the (I → II) phase transition temperature. Combined impedance and modulus plots were used as tools to analyze the sample behavior as a function of frequency at different temperatures. The modulus analysis and impedance studies showed the non-Debye dielectric relaxation nature. The Z′ and Z″ versus frequency plots in both phases I and II can be modeled as a parallel contribution of bulk resistance Rp and a constant phase element (CPE). The frequency dependence of the complex conductivity and the electric modulus spectra are analyzed by the “universal dielectric response” (UDR) and Kohlrausch, Williams, and Watts (KWW) approaches, and a comparison between the parameters derived from the two approaches has been discussed.
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