Frequency-dependent conductivity in lithium-diffused and annealed GaAs

Guðmundsson, Jón Tómas; Svavarsson, H. G.; Guðjónsson, Sigurður; Gíslason, H. P.

doi:10.1016/j.physb.2003.09.082

Cited by 78 publications

(34 citation statements)

References 15 publications

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“…According to the non-overlapping small polaron tunneling model (NSPT), the exponent s increases with the increase of temperature [40]. Therefore, the NSPT model is the most suitable model to characterize the electrical conduction mechanism in the La 0.8 Ca 0.2 FeO 3 compound.…”

Section: Eq (7)mentioning

confidence: 99%

Dielectric properties and alternating current conductivity of sol–gel made La0.8Ca0.2FeO3 compound

Benali

Souissi

Bejar

et al. 2015

Chemical Physics Letters

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Section: Eq (7)mentioning

confidence: 99%

Dielectric properties and alternating current conductivity of sol–gel made La0.8Ca0.2FeO3 compound

Benali

Souissi

Bejar

et al. 2015

Chemical Physics Letters

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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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“…The ac conductivity shows a typical behavior: a power-law increase at frequencies between 10 3 -10 6-7 Hz. The frequency dependence of the ac conductivity is given by the power law [17];…”

Section: Methodsmentioning

confidence: 99%

“…The frequency dependent exponent s is a characteristic parameter representing the many body interactions of the electrons, charges and impurities [18]. It depends on the material temperature and is generally less than or equal to unity [17]; for ideal Debye type samples it is equal to unity. The values of the frequency exponent s are estimated from the slopes of the log-log curves.…”

Section: Methodsmentioning

confidence: 99%

Incommensurate phase properties of TlGaSe₂layered crystals

Şentürk

Tumbek

Salehli

et al. 2005

Cryst. Res. Technol.

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The frequency and time dependence of the ac conductivity were measured within incommensurate phase in the frequency range 10 1 -107 Hz and analyzed. The electrical conductivity decreases with decreasing temperature, then saturates in mentioned temperature interval. The ac conductivity is proportional to w s . The value f s decreases with increasing temperature which suggests hopping conduction mechanism. The time dependence of the conductivity exhibited exponential decay. It shows two conductivity relaxations in mentioned temperature interval. Moreover, the characteristic relaxation times decrease with decreasing annealing temperature. The two different relaxation times refer to two different incommensurate ordering in mentioned temperature interval.

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Frequency-dependent conductivity in lithium-diffused and annealed GaAs

Cited by 78 publications

References 15 publications

Dielectric properties and alternating current conductivity of sol–gel made La0.8Ca0.2FeO3 compound

Dielectric properties and alternating current conductivity of sol–gel made La0.8Ca0.2FeO3 compound

NMR study and electrical properties investigation of Zn2P2O7

Incommensurate phase properties of TlGaSe₂layered crystals

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Frequency-dependent conductivity in lithium-diffused and annealed GaAs

Cited by 78 publications

References 15 publications

Dielectric properties and alternating current conductivity of sol–gel made La0.8Ca0.2FeO3 compound

Dielectric properties and alternating current conductivity of sol–gel made La0.8Ca0.2FeO3 compound

NMR study and electrical properties investigation of Zn2P2O7

Incommensurate phase properties of TlGaSe2layered crystals

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Product

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Incommensurate phase properties of TlGaSe₂layered crystals