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Dr. Reda MahsouP El-Naby Mohamed Baioumy Khalil :: Publications:

Impedance and modulus spectroscopy of poly(vinyl alcohol)- Mg[ClO4]2 salt hybrid films
Authors: R.Khalil
Year: 2017
Keywords: impedance; Non-Debye; electric modulus; Magnesium Salt; electrolytes
Journal: Applied Physics A
Volume: 123
Issue: Not Available
Pages: 422
Publisher: springer
Local/International: International
Paper Link:
Full paper Reda MahsouP El-Naby Mohamed Baioumy Khalil_Impedance and modulus spectroscopy of poly(vinyl alcohol)-Mg%5bClO4%5d2 salts hybrid films.pdf
Supplementary materials Not Available

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 nonDebye 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 Z00, imaginary part of complex impedance, and M00, 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 noncoincidence of peaks corresponding to the modulus and impedance indicates deviation from Debye-type relaxation.

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