Ac conductivity and dielectric properties of amorphous In2Se3 films

Afifi, M. A.; Bekheet, A.E.; Elwahhab, E. Abd; Atyia, H.E.

doi:10.1016/s0042-207x(00)00416-4

Cited by 107 publications

(30 citation statements)

References 27 publications

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“…It is found that exponent n varies between 0.11 and 0.39 as the temperature varies from 253 K to 313 K. Different theoretical models have been developed to correlate the temperature dependence of exponent n behaviour with the conduction mechanism of a material. According to quantum mechanical tunneling (QMT) model, ac conductivity shows a linear variation with temperature [23,24], the exponent n is almost equal to 0.8 and temperature independent [25]. In the correlated barrier hopping (CBH) model, the exponent n is predicted to be temperature dependent with exponent n increasing towards unity as T --~ model also predicts the exponent n is temperature dependent.…”

Section: Resultsmentioning

confidence: 99%

Dielectric behaviour and AC conductivity of LiCF3SO3 doped H-chitosan polymer films

Winie

Arof

2004

Ionics

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Abstract. H-chitosan that exhibited solubility in THF was prepared by acyl modification of chitosan. Films of H-chitosan containing LiCF3SO 3 were prepared by the solution cast technique. The effect of salt concentration on the frequency-dependent dielectric properties of H-chitosan: LiCF3SO 3 complexes were investigated by impedance spectroscopy, in the temperature range from 243 to 373 K. The dielectric properties and ac conductivity of the samples prepared have been analyzed. The dielectric constant increases sharply with temperature in the low frequency region. At higher frequencies, the effect of temperature on the dielectric constant is negligible. The values of dielectric constant were also found to increase with increasing conductivity of the samples. The imaginary part, Mi of electrical modulus shows the formation of dispersion peak. Relaxation times for the ionic charge carriers were extracted from the loss tangent maximum peak at various temperatures. The plot of relaxation times as a function of temperature shows Arrhenius type behaviour. The ac conductivity was found to obey the universal power law and as the temperature increases, the feature of ~3(co) ~ co n is more predominant. The temperature dependence of the power law exponent n is reasonably interpreted by the overlapping large polaron tunneling (OLPT) model.

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Section: Resultsmentioning

confidence: 99%

Dielectric behaviour and AC conductivity of LiCF3SO3 doped H-chitosan polymer films

Winie

Arof

2004

Ionics

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“…In the OLPT model, the exponent n depends on both frequency and temperature and drops with rising temperature to a minimum value and then increases as temperature rises. In the CBH model that describes charge carrier hops between sites over the potential barrier separating them, n decreases with the increment in temperature [33][34][35].…”

Section: Conductivity Analysismentioning

confidence: 99%

NMR study and electrical properties investigation of Zn2P2O7

Jarboui

Rhaeim

Hlel

et al. 2009

Ionics

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The α-Zn 2 P 2 O 7 compound was obtained by conventional solid-state reaction. The sample was characterized by X-ray powder diffraction, solid state 31 P NMR MAS, and electrical impedance spectroscopy. The solid state 31 P MAS NMR, performed at 121.49 MHz, shows three isotropic resonances at −21.1, −18.8, and −15.8 ppm, confirming the non-equivalency of the three PO 4 groups in the α-Zn 2 P 2 O 7 form. They are characterized by different chemical shift tensor parameters with the local geometrical features of the tetrahedra. Electrical impedance measurements of β-Zn 2 P 2 O 7 , form stable for temperature greater than 403 K, were performed as a function of both temperature and frequency. The electrical conduction and dielectric relaxation have been studied. The AC conductivity obeys the universal power law. The approximation type correlated barrier hopping model explains the universal behavior of the n exponent. The impedance plane plot shows semicircle arcs at different temperatures, and an electrical equivalent circuit has been proposed to explain the impedance results. The circuits consist of the parallel combination of bulk resistance R p and constant phase elements CPE. The simulated spectra show a good correlation with the experimental data.

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“…Different theoretical models have been proposed to correlate the temperature dependence of exponent, s with the conduction mechanism of the materials. According to the quantum mechanical tunneling (QMT) model, the exponent s is almost temperature independent (Afifi et al, 2001). Thus the conduction mechanism for the present electrolyte system could be interpreted based on the QMT model.…”

Section: Resultsmentioning

confidence: 88%

Dielectric and AC conductivity behavior of Hexanoyl Chitosan-NaI based polymer electrolytes

Muhammad

Jamal²,

Winie

2016

Int. j. adv. appl. sci

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Hexanoyl chitosan-sodium iodide (NaI) complexes were prepared using solution casting method. The temperature dependence conductivity was performed in the temperature range of 303-343K. From the dielectric studies, it has been observed that the dielectric constant, εr and dielectric loss, εi increases with temperature in the lower frequency region and almost negligible in the higher frequency region. This behavior can be explained on the basis of electrode polarization. Plot of real part, Mr and imaginary part, Mi of modulus versus frequency indicates that the systems are predominantly ionic conductor. Relaxation time calculated from the peak of Mi at various temperatures appears to be thermally activated. The conductivity, σ(ω) is found to be almost frequency independent at low frequencies and became frequency dependent at high frequencies. The transference number measurement showed that the conductivity was predominantly ionic.

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Ac conductivity and dielectric properties of amorphous In2Se3 films

Cited by 107 publications

References 27 publications

Dielectric behaviour and AC conductivity of LiCF3SO3 doped H-chitosan polymer films

Dielectric behaviour and AC conductivity of LiCF3SO3 doped H-chitosan polymer films

NMR study and electrical properties investigation of Zn2P2O7

Dielectric and AC conductivity behavior of Hexanoyl Chitosan-NaI based polymer electrolytes

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