Scaling description of non-ohmic direct current conduction in disordered systems

Nandi, U. N.; Jana, Debnarayan; Talukdar, D.

doi:10.1016/j.pmatsci.2014.12.001

Cited by 29 publications

(21 citation statements)

References 226 publications

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“…In classic electric percolation theory, both Ohmic and non-Ohmic conduction mechanisms in composite dielectrics have been proposed [ 47 ]. The former is induced after percolation, while the latter is triggered before percolation.…”

Section: Resultsmentioning

confidence: 99%

Enhancing High-Frequency Dielectric Properties of Beta-SiC Filled Nanocomposites from Synergy between Percolation and Polarization

Peng

Feng

2018

Materials

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Promising comprehensive properties, including high permittivity, low dielectric loss, high breakdown strength, low electrical conductivity, and high thermal conductivity, are very hard to simultaneously obtain in high-frequency applicable polymer nanocomposite dielectrics. Instead of traditional electric percolation, in this work, a novel route based on a synergy between electric percolation and induced polarization has been raised to prepare 0–3 type nanocomposites with an enhanced high permittivity (high-k) property and low loss at high frequency. This work aimed at optimizing that synergy to achieve the favorable properties mentioned above in composite dielectrics used at high frequencies such as 1 MHz and 1 GHz. Conductive beta-SiC nanoparticles with a particle size of ~30 nm were employed as filler and both insulating poly(vinyl alcohol) and polyvinyl chloride were employed as polymer matrices to construct two composite systems. Utilizing polyvinyl chloride rather than poly(vinyl alcohol) realizes higher comprehensive electrical properties in composites, ascribed to optimization of that synergy. The optimization was achieved based on a combination of mild induced polarization and polarization-assisted electric percolation. Therefore, this work might open the way for large-scale production of high-frequency applicable composite dielectrics with competitive comprehensive electrical properties.

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Section: Resultsmentioning

confidence: 99%

Enhancing High-Frequency Dielectric Properties of Beta-SiC Filled Nanocomposites from Synergy between Percolation and Polarization

Peng

Feng

2018

Materials

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“…With increase in voltage beyond R 0 , R decreases steadily from R 0 up to the measured value of the applied voltage. These systems show nonOhmic electrical conduction characterized by the onset voltage V 0 which scales with

{normalΣ}_{0}

V_{0} true(T true) \approx {normalΣ}_{0}^{x_{T}}

with

x_{T}

as the nonlinearity exponent . The subscript T indicates that

{normalΣ}_{0}

is varied by T keeping other parameters fixed.…”

Section: Resultsmentioning

confidence: 99%

Bias Exponent of Resistance Noise as a Probe for Disordered Systems

Dey¹,

Nandi²,

Talukdar³

et al. 2018

Physica Status Solidi (b)

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The power spectral density Sv(f) of voltage fluctuations in the Ohmic regime of a system varies with voltage V as Sv(f) ≈ Vβ where β is the bias exponent. The equilibrium resistance fluctuation in a homogeneous system provides β = 2 but in disordered systems, we show that β strongly depends on quenched disorder and temperature and is less than 2 in the Ohmic region. At a fixed temperature, β remains nearly equal to 2 at low disorder and decreases from 2 to 1 with the increase in disorder. Interestingly, similar variation in β is observed with the change in temperature from high to low at a fixed quenched disorder. These two cases favor weak localization in the limit of high disorder or low temperature. Experimental results on manganite compounds indicate that the bias exponent β could be used as a sensible nondestructive parameter to identify the existence of a phase transition evolved during the course of investigation. Remarkable correlations between the electrical transport and the power spectral density Sv(f) are observed and explained with the help of inhomogeneous distribution of currents. The results are also supported by the non‐Gaussian nature of the second spectrum of 1/f noise at different temperatures.

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“…Similarity in the behavior of

Σ - V

and

\frac{d I}{d V} - V

, shown respectively in Figures (a) and 6(a), signifies that both the data set could be collapsed into master curves and described by a suitable scaling function. Such scaling function can formally be expressed as:

\frac{Σ true(A T,, V true)}{Σ true(A T, 0 true)} = g true(\frac{V}{V_{0} true(A T true)} true),

where g is a scaling function and the voltage scale

V_{0} true(A T true)

for the samples with different annealing temperatures is given by Eq. .…”

Section: Resultsmentioning

confidence: 99%

Effect of Annealing Temperature on the Structural and the Electrical Transport Properties of La₂NiMnO₆ Nanoparticles

Chakraborty

Nandi²,

Dey³

et al. 2017

Physica Status Solidi (b)

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The effect of annealing temperatures on the structural and the electrical transport properties of La2NiMnO6 nanoparticles is investigated in detail. The grain size, grain boundary and the antisite disorder (ASD) are affected by the annealing temperature during the preparative conditions of annealing. The HRTEM image indicates that the average grain size increases with annealing temperature providing a platform for explanation of the transport data. Both I−V and dIdV−V measurements show that the electrical conduction is non‐Ohmic and characterized by a voltage V0true(ATtrue), known as the onset voltage, which scales with the Ohmic conductance Σ0true(ATtrue) as V0true(ATtrue)∼Σ0true(Ttrue)xAT, xAT being the onset exponent having negative values in both cases. AT refers to the fact that Σ0true(ATtrue) is changed by the annealing temperature (AT). V0true(ATtrue) depends strongly on the grain size and grain boundaries and decreases with the increase in annealing temperature. The negative value of xAT is physically understood from the concept of inter‐granular tunneling effect. This non‐Ohmic conduction, onset voltage V0true(ATtrue) and onset exponent xAT are qualitatively explained by considering the conduction through both the ordered and disordered regions and by applying Glazman–Matveev model. The transport data are systematically analyzed within the framework of scaling formalism.

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Scaling description of non-ohmic direct current conduction in disordered systems

Cited by 29 publications

References 226 publications

Enhancing High-Frequency Dielectric Properties of Beta-SiC Filled Nanocomposites from Synergy between Percolation and Polarization

Enhancing High-Frequency Dielectric Properties of Beta-SiC Filled Nanocomposites from Synergy between Percolation and Polarization

Bias Exponent of Resistance Noise as a Probe for Disordered Systems

Effect of Annealing Temperature on the Structural and the Electrical Transport Properties of La₂NiMnO₆ Nanoparticles

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Scaling description of non-ohmic direct current conduction in disordered systems

Cited by 29 publications

References 226 publications

Enhancing High-Frequency Dielectric Properties of Beta-SiC Filled Nanocomposites from Synergy between Percolation and Polarization

Enhancing High-Frequency Dielectric Properties of Beta-SiC Filled Nanocomposites from Synergy between Percolation and Polarization

Bias Exponent of Resistance Noise as a Probe for Disordered Systems

Effect of Annealing Temperature on the Structural and the Electrical Transport Properties of La2NiMnO6 Nanoparticles

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Effect of Annealing Temperature on the Structural and the Electrical Transport Properties of La₂NiMnO₆ Nanoparticles