Determination of density of defect states in glassy Se 98 M 2 (M = Ag, Cd and Sn) alloys using a.c. conductivity measurements

Sharma, Arvind Kumar; Kumar, Amit; Mehta, N.

doi:10.1016/j.measurement.2015.07.033

Cited by 24 publications

(6 citation statements)

References 29 publications

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“…These plots yield the magnitude of exponents 's 1 and s 2 ' and σ dc for various temperatures from 173 K to 473 K. The obtained exponents 's 1 and s 2 ' are plotted against temperature in figure 7, from this figure it is clear that the magnitude of exponent s 1 decreases from 1.03 to 0.03 and the exponent s 2 decreases from 2.00 to 0.19 as the temperature increases from 173 K to 473 K, respectively. This behaviour is in-line with those systems which exhibit the CBH conduction mechanism (according to CBH the magnitude of s must decrease with temperature) [33,43]. Existence of similar type of CBH conduction mechanism and the decreasing trend of the exponents 's 1 ' and 's 2 ' with temperature have been observed in several perovskite and spinel oxides such as La 0.9 Sr 0.1 MnO 3 [44], BaZr 0.1 Ti 0.9 O 3 [45] and MgCr 2 O 4 [46].…”

Section: Ac Conductivity Analysissupporting

confidence: 85%

“…In the CBH model, the nearest neighbouring Coulombic potential wells overlap, thereby reducing the maximum barrier height W m to a lower value W (called effective barrier height) as described in equation ( 4). The charge carriers hop over this effective coulombic barrier height W to the neighbouring vacant sites at a hopping length R which is usually termed as 'shortrange translational hopping' mechanism as shown in figure 8 [34,43],…”

Section: ωτmentioning

confidence: 99%

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Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb₂O₆

Maruthi¹,

Deshpande²,

Deshmukh³

et al. 2022

J. Phys. D: Appl. Phys.

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A comprehensive study on the mechanism of ac-charge transport and dielectric relaxation in the MnNb2O6 Columbite system has been reported. Thermally driven, Arrhenius-like behavior of the ac-conductivity (σ(ω,T)) is predominant at temperatures above 300 K in the frequency range 50 Hz to 5 MHz with activation energies (Eac) lying between 0.45 and 0.38 eV. Besides, a quadratically decreasing trend in the activation energy is evident as given by: Eac(f) = A + B f + C f 2 with the constants A (0.413 eV), B (0.023 eV/Hz) and C (-0.004 eV/Hz2). The measured σ(ω,T) data is analyzed using the Double power law to explain the dispersive behavior of electrical conductivity. These studies also provide evidence for the correlated-barrier hopping (CBH) conduction mechanism of charge carriers for temperatures in the range 173 K to 473 K. Further, the temperature dependence of frequency exponent, s(T) displays two distinct regions both of which are associated with the CBH mechanism. However, the second region is more dominated by thermally activated Arrhenius-like behavior. The dynamical response of complex electric modulus spectra (M*(ω,T)) and the corresponding analysis using Kohlrausch-Williams-Watts method reveals the presence of a non-Debye type relaxation process with decay function exponent β lying between 0.794 and 0.840. This inference of the non-Debye type relaxation process is further supported by depressed semicircles in Nyquist plots and the higher magnitude of FWHM (~ 1.44 decades) of the normalized master cusp (M′′/M′′max vs. ω/ωmax) compared to the FWHM (= 1.14 decades) for ideal Debye behaviour. Both short-range and long-range conductivity regions are ubiquitous in M*(ω,T) with a pronounced distribution of relaxation times (τ ~ 935.8 - 0.36 μs) with temperature. This study further leads to the estimation of activation energy of charge carriers, Em = 0.44 eV which is in consonance with Eac(f,T).

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Section: Ac Conductivity Analysissupporting

confidence: 85%

Section: ωτmentioning

confidence: 99%

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb₂O₆

Maruthi¹,

Deshpande²,

Deshmukh³

et al. 2022

J. Phys. D: Appl. Phys.

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“…Such measurement also helps to estimate the density of charged defect states. 37 As mentioned earlier, the a.c. conduction in chalcogenide glasses can be explained in terms of both single polaron hopping and bi-polaron hopping. With this point of view, the experimental data have been tted according to CBH model.…”

Section: Resultsmentioning

confidence: 78%

Comprehensive studies of temperature and frequency dependent dielectric and a.c. conducting parameters in third generation multi-component glasses

2018

Self Cite

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“…It is known that the AC electrical conductivity of a substance exhibiting hopping conduction obeys Jonscher's power law and it is expressed as Eq. ( 1) [10,16,17],…”

Section: Resultsmentioning

confidence: 99%

“…The polaron binding energy, Wm and the lower bound cut off to hopping distance, Rmin were calculated using Eqs. (2) [16] and (3) [17], respectively,…”

Section: Resultsmentioning

confidence: 99%

Structural, Optical and AC Conductivity Studies on Polycrystalline-Si/Nanocrystalline-FeSi<sub>2</sub> Composite Thin Films

Saito

Katsumata

2020

JJAP Conf. Proc.

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We investigated an electrical conduction mechanism of Si/FeSi2 composite films by measuring a frequency dependence of AC electrical conductivity. The results were analyzed based upon Jonscher's power law. The hopping conduction obeying the Jonscher's power law was observed for a-Si single films after annealing as well as Si/FeSi2 composite films annealed at 550 and 900℃. From the analysis of XRD, optical absorption, TEM/EDS and AC conductivity, we conclude that the electrical conduction mechanisms in polycrystalline (poly)-Si/β-FeSi2 annealed at 550℃ and poly-Si/α-and β-FeSi2 annealed at 900℃ are due to electron hopping via the conduction band of β-FeSi2 and α-FeSi2 nanocrystals embedded in poly-Si thin films, respectively.

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Determination of density of defect states in glassy Se 98 M 2 (M = Ag, Cd and Sn) alloys using a.c. conductivity measurements

Cited by 24 publications

References 29 publications

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb₂O₆

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb₂O₆

Comprehensive studies of temperature and frequency dependent dielectric and a.c. conducting parameters in third generation multi-component glasses

Structural, Optical and AC Conductivity Studies on Polycrystalline-Si/Nanocrystalline-FeSi<sub>2</sub> Composite Thin Films

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Determination of density of defect states in glassy Se 98 M 2 (M = Ag, Cd and Sn) alloys using a.c. conductivity measurements

Cited by 24 publications

References 29 publications

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb2O6

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb2O6

Comprehensive studies of temperature and frequency dependent dielectric and a.c. conducting parameters in third generation multi-component glasses

Structural, Optical and AC Conductivity Studies on Polycrystalline-Si/Nanocrystalline-FeSi<sub>2</sub> Composite Thin Films

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Product

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Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb₂O₆

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb₂O₆