Effect of LaNiO3 on the impedance and dielectric properties of CoFe2O4: a high temperature study

Patra, Ananya; Prasad, V.

doi:10.1088/1361-6463/ab4842

Cited by 13 publications

(6 citation statements)

References 64 publications

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“…The fact that α relaxation should be related to amorphous-crystal interfaces is consistent with this apparent direct dependency. The DC conductivity follows the Arrhenius-type thermal activation process [68,69]:…”

Section: Dielectric Modulus (M")mentioning

confidence: 99%

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Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Marín-Genescà¹,

García-Amorós²,

Mujal-Rosas³

et al. 2020

Polymers

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The waste rubber vulcanizate, on account of its stable, cross-linked and three-dimensional structural arrangement, is difficult to biodegrade. Thus, the ever-increasing bulk of worn-out tires is a serious environmental issue and its safe disposal is still a challenging task reported widely by the scientific community. The rubber materials, once they end their useful life, may present difficulties to be reused or recycled. At present, only one tire recycling method is used, which involves grinding and separating steel and fibers from vulcanized rubber, and then using rubber for industrial applications, such as flooring, insulation, footwear. In this paper, a new compound material is presented from a base of reused tire powder (Ground Tire Rubber: GTR) as a mixer and linear low-density polyethylene (LLDPE) as a matrix. The reused tire powder, resulting from grinding industrial processes, is separated by sieving into just one category of particle size (<200 μm) and mixed with the LLDPE in different amounts (0%, 5%, 10%, 20%, 40%, 50% and 70% GTR). Due to the good electrical properties of the LLDPE, this study’s focus is settled on the electrical behavior of the obtained composites. The test of the dielectric behavior is carried out by means of DEA test (Dynamic Electric Analysis), undertaken at a range of temperatures varying from 30 to 120 °C, and with a range of frequencies from 1 to 102, to 3·106 Hz, from which permittivity, conductivity, dielectric constant and electric modulus have been obtained. From these experimental results and their analysis, it can be drawn that the additions of different quantities of GTR to LLDPE could be used as industrial applications, such as universal electrical cable joint, filler for electrical applications or cable tray systems and cable ladder system.

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Section: Dielectric Modulus (M")mentioning

confidence: 99%

“…Although the addition of GTR, which contains carbon black, increases the DC conductivity, this reduction in motion possibilities avoids a significant increase in DC conductivity. The DC conductivity follows the Arrhenius-type thermal activation process [68,69]:…”

Section: Lldpe/gtr Activation Energies (Ea)mentioning

confidence: 99%

Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Marín-Genescà¹,

García-Amorós²,

Mujal-Rosas³

et al. 2020

Polymers

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“…Also, after a certain high frequency, the ac conductivity decreases with frequency. This decrease of conductivity occurs due to the emergence of free charge conduction in the system [27]. In the CNT/PANI composite, the ac conductivity decreases with an increase in frequency in the dispersive region, which significantly contrasts with PANI (see figures 2(e) and (f)).…”

Section: Resultsmentioning

confidence: 94%

Influence of the chemical functionalization of carbon nanotubes on low temperature ac conductivity with polyaniline composites

Maity

Patra

Prasad

2020

J. Phys. D: Appl. Phys.

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We report the ac conductivity measurement of polyaniline (PANI) composites with carbon nanotubes (CNT) and functionalized carbon nanotubes (fCNT) with different degrees of functionalization from 300 K–4.2 K in the frequency range 40 Hz–5 MHz. The ac conductivity of PANI follows the universal power law and the charge transport is dominated by small polaron tunneling. In the CNT/PANI composite, metallic behaviour emerges, and ac conductivity does not obey the power law which is explained by the Drude model. Due to the chemical functionalization of CNT, disordered semiconducting behaviour appears in the transport below 50 K and follows the Johnscher’s power law. The enhancement of polaron formation due to the polar interaction between fCNT and PANI is reflected in the ac conductivity of the composites. The charge transport is manifested by single electron tunneling for a lower degree of fCNT/PANI (6 h) composite which changes to small polaron tunneling transport for a higher degree of fCNT/PANI (48 h) composite. The dc conductivity behaviour is explained by Mott’s VRH model and the characteristic Mott temperature increases with an increasing degree of chemical functionalization.

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“…In this case the negative permittivity appears only in a narrow range near the resonance frequency. The resonance-type negative permittivity behavior can be well described by Lorentz model [48,104]:…”

Section: Mechanism Of Negative Permittivity In Enmsmentioning

confidence: 99%

Epsilon-negative media from the viewpoint of materials science

et al. 2021

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A comprehensive review of the fundamentals and applications of epsilon-negative materials is presented in this paper. Percolative composites, as well as homogeneous ceramics or polymers, have been investigated to obtain the tailorable epsilon-negative properties. It's confirmed the anomalous epsilon-negative property can be realized in conventional materials. Meanwhile, from the perspective of materials science, the relationship between the negative permittivity and the composition and microstructure of materials has been clarified. It's demonstrated that the epsilon-negative performance is attributed to the plasmonic response of delocalized electrons within the materials and can be modulated by it. Moreover, the potential applications of epsilon-negative materials in electromagnetic interference shielding, laminated composites for multilayered capacitance, coil-less electric inductors, and epsilon-near-zero metamaterials are reviewed. The development of epsilon-negative materials has enriched the connotation of metamaterials and advanced functional materials, and has accelerated the integration of metamaterials and natural materials.

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Effect of LaNiO₃ on the impedance and dielectric properties of CoFe₂O₄: a high temperature study

Cited by 13 publications

References 64 publications

Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Influence of the chemical functionalization of carbon nanotubes on low temperature ac conductivity with polyaniline composites

Epsilon-negative media from the viewpoint of materials science

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