The Thermoelectrical Behavior of PEO Films Doped with MnCl<sub>2</sub> Salt

Ahmad, A.; Saq'an, S.; Ramadin, Y.; Zihlif, A. M.

doi:10.1177/0892705706063926

Cited by 13 publications

(4 citation statements)

References 23 publications

(33 reference statements)

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“…The decrease in the dielectric loss with frequency may be attributed to higher induced conductive behavior. [20][21][22][23] Cement polymer composite at T = 30 Jonscher universal power law 15,16,24 based on the aspect of conduction paths accessible for electric charge flow in polymer networks takes the form where A and n are coefficients, s 0 is usually identified as the DC conductivity of the material, and s AC is the frequency-dependent conductivity. At higher frequencies, the conductivity increases as a power of frequency with a power exponent n < 1.…”

Section: Resultsmentioning

confidence: 99%

The AC electrical behavior of cement–polymer composite

Zihlif

Ayish

Elimat

2012

Journal of Thermoplastic Composite Materials

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The electrical properties of cement-polyvinyl alcohol were studied using the impedance measuring technique. The study has been carried out under different temperatures and frequencies. Some electrical quantities such as AC conductivity, dielectric constant, activation energy, and relaxation time of the conduction process were determined from collected impedance data, at a frequency range from 20 kHz to 1 MHz and temperatures of 30-105 C. It was found that the measured electrical quantities have frequency and temperature dependence. The dielectric constant and dielectric loss increase with increasing temperature and decrease with the applied frequency. The AC conductivity increases with increasing temperature and frequency. The calculated values of the activation energy and relaxation time vary with temperature and frequency. The observed enhancement in the electrical conductivity with increasing temperature may be due to electron hopping between the intrinsic localized states in composite composition. The increase in the dielectric constant with temperature is attributed to space charge, ions, and metallic inclusions existing in the cement structure.

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Section: Resultsmentioning

confidence: 99%

The AC electrical behavior of cement–polymer composite

Zihlif

Ayish

Elimat

2012

Journal of Thermoplastic Composite Materials

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“…These effects enhance the polarization and makes the system not to behave as a solid polymer electrolyte, with enhanced conductivity. 11,21…”

Section: Discussionmentioning

confidence: 99%

“…8,9 The objective of this research is to investigate the electrical and dielectrical behavior of a hybrid system composed using PEO polymer, CaCO 3 , and water traces, that is a fluid system. Our previous studies 5,10,11 on doping of the PEO polymer showed enhancement of the ionic conductivity and dielectric constants due to the formation of doped PEO complexes. Now the question is whether ionic conductivity enhancement can take place in this doped fluid system.…”

Section: Introductionmentioning

confidence: 89%

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Al-Ahmad

Zihlif

2011

Journal of Thermoplastic Composite Materials

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This work is based on studying the alternating current (AC) electrical properties of poly (ethylene oxide) (PEO) films doped with ultrafine calcium carbonate (CaCO3). The composite films with 80 μm thickness were prepared by casting method using the solution containing PEO resin, CaCO3, and water, forming a polymeric fluid system. The impedance was measured in the frequency range from 1 to 50 kHz at different temperatures. The concentrations of CaCO3 are 0, 1, 4, 6, and 10% by weight. From impedance results, it was found that the AC conductivity decreases with increasing dopant concentration and increases with increasing temperature. The values of the dielectric constant and the dielectric loss decrease with increasing frequency. The calculated activation energy and the relaxation time showed dependence on frequency and temperature. The determined values of the refractive index decrease with increasing frequency and CaCO3 concentration and increase with increasing temperature. The observed decreases in the AC-electrical quantities of the prepared thin films (fluid system) are attributed to the presence of water traces that enhance the polarization effects. The decreases in values of dielectric constants and conductivity indicate that the doped PEO system does not behave as a solid polymer electrolyte with enhanced ionic conduction.

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“…5 On the other hand, the dielectric spectra and relaxation processes of electrolyte polymers and polymer electrolytes have been studied before but the dielectric properties especially the relaxation process and the estimation of relaxation time using Yan and Rhodes model for PEO/NH 4 I electrolytes have not been previously reported. [1][2][3][4][5][6][7][8][9][10][11][12][13] When the dielectric material is exposed to an alternating electric field that is generated by applying a sinusoidal voltage the displacement polarization leads to electric oscillations. The orientational polarization is not a resonant process, because the molecular dipoles have inertia.…”

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confidence: 99%

Dielectric Properties of Polyethylene Oxide Doped with NH4I Salt

Ayesh

2009

Polym. J.

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Dielectric parameters were studied over a frequency range from 10 Hz to 335 kHz at room temperature as a function of frequency and salt concentration. Permittivity (" 0 ) and dielectric loss (" 00 ) data were fitted in the frequency domain using Yan and Rhodes model in order to estimate the relaxation times for PEO electrolytes. Due to the excellent fitting obtained using this model, PEO/NH 4 I electrolytes can be presented in equivalent circuit as RC in parallel circuits connected in series Addition of NH 4 I salt to PEO host, however, will increase AC conductivity, permittivity and dielectric loss while shortening relaxation time and reduces the melting temperature of PEO electrolytes. This study shows that the relaxation process of these electrolytes is due to viscoelastic relaxation or non-Debye relaxation with two values of relaxation time.KEY WORDS: Polyethylene Oxide / NH 4 I Salt / Electrolytes / Dielectric Relaxation / Relaxation Time / Melting Behavior / Polymer electrolytes such as PEO play an important role in the development of new energy sources, like solid state batteries, photo-electrochemical solar cells, fuel cells, electrochromic displays and sensors. Up to now, the desired value of electrical conductivity (10 À3 S/cm) at ambient temperature has not been attained. At the same time, obtaining high ionic conductivity at ambient temperature becomes crucial for the realization of these technological applications.1,2 Extensive theoretical and experimental research is necessary in order to explain the theory of ionic conductivity in polymer/salt electrolytes, because this theory is yet in its infancy due to the complex structural nature of polymers. In general, experimental and theoretical research shows that the enhancement of ionic conductivity in polymer/salt electrolytes depend on polymer type, salt type, morphology, nature and size of fillers, degree of crystallinity . . . etc.3-5 Also, several research works have demonstrated that the addition of an optimum amount of an electrolytic filler greatly enhances the ionic conductivity and affects the bulk properties of the electrolytes.5-10 Interesting effects were observed by us on the optoelectrical properties of PS/alum composites. 5 On the other hand, the dielectric spectra and relaxation processes of electrolyte polymers and polymer electrolytes have been studied before but the dielectric properties especially the relaxation process and the estimation of relaxation time using Yan and Rhodes model for PEO/NH 4 I electrolytes have not been previously reported. [1][2][3][4][5][6][7][8][9][10][11][12][13] When the dielectric material is exposed to an alternating electric field that is generated by applying a sinusoidal voltage the displacement polarization leads to electric oscillations. The orientational polarization is not a resonant process, because the molecular dipoles have inertia. The response of the orientational polarization to a change of the electric field is therefore always retarded. This process is called ''dielectric relaxation.'' Th...

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The Thermoelectrical Behavior of PEO Films Doped with MnCl₂ Salt

Cited by 13 publications

References 23 publications

The AC electrical behavior of cement–polymer composite

The AC electrical behavior of cement–polymer composite

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Dielectric Properties of Polyethylene Oxide Doped with NH4I Salt

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The Thermoelectrical Behavior of PEO Films Doped with MnCl2 Salt

Cited by 13 publications

References 23 publications

The AC electrical behavior of cement–polymer composite

The AC electrical behavior of cement–polymer composite

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Dielectric Properties of Polyethylene Oxide Doped with NH4I Salt

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The Thermoelectrical Behavior of PEO Films Doped with MnCl₂ Salt