Abstract
The electrical and dielectric properties of PVA/Mg[ClO4]2 hybrid films were investigated in the temperature range of 90–150 °C and the frequency range of 20 Hz–10 MHz using impedance and modulus spectroscopy. Impedance and modulus analyses had indicated the temperature independent distribution of relaxation times and the non-Debye behavior in these composites. The co-operative motion due to strong coupling between the mobile Mg2+ ions is assumed to give rise to non-Debye type of relaxation. Complex impedance Nyquist plots are used to interpret the relaxation mechanism. The nature of Nyquist plot confirms the presence of bulk effects, grain boundaries and electrolyte/electrode polarization, and non-Debye type of relaxation processes occurs in the composites. A thermally activated relaxation was observed, which was ascribed to be a non-Debye-type relaxation caused by the mobility of magnesium ion in polymer matrix. A comparison between Z″, imaginary part of complex impedance, and M″, imaginary part of complex electric modulus, indicates that the short- and long-range charge motion dominates at low and high temperatures, respectively. The activation energies, which were obtained from the electric modulus and bulk conductivity, are matched well. The non-coincidence of peaks corresponding to the modulus and impedance indicates deviation from Debye-type relaxation.
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Khalil, R. Impedance and modulus spectroscopy of poly(vinyl alcohol)-Mg[ClO4]2 salt hybrid films. Appl. Phys. A 123, 422 (2017). https://doi.org/10.1007/s00339-017-1026-y
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DOI: https://doi.org/10.1007/s00339-017-1026-y