Dielectric relaxation behavior and overlapping large polaron tunneling conduction mechanism in NiO–PbO μ-cauliflower composites

Karmakar, Subrata; Tyagi, Himanshu; Mohapatra, D.P.; Behera, D.

doi:10.1016/j.jallcom.2020.156789

Cited by 25 publications

(3 citation statements)

References 59 publications

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“…The values of exponent s are evaluated after fitting the experimental data with eq.6. As shown in Table .3, the exponents often increased with increasing the temperature, and this behavior is consistent with overlapping large-polaron tunneling model [29] .…”

Section: Resultssupporting

confidence: 85%

FTIR and dielectric relaxation analysis for PVC-Pb3O4 polymer nanocomposites

Taha

Mahmoud

Hayat

et al. 2021

Preprint

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This work studies the FTIR as well as dielectric characteristics of the PVC-Pb3O4 nanocomposite films. FTIR analysis shows the small shift in 650, 845 and 1732 cm− 1 band positions as a confirmation of interaction between Pb3O4 nanoparticles with PVC polymer matrix. The real permittivity (ε1) decreases with increasing frequency for all samples with the appearance of a relaxation peak at high temperatures. The dielectric loss data (ε2) of the PVC-Pb3O4 nanocomposite revealed a shift of the dielectric absorption peak towards high frequency with increasing the temperature. The activation energy values for both α and β relaxations almost decreased with increasing the Pb3O4 concentration. The energy density of samples containing Pb3O4 has a lower energy density than the pure PVC polymer film. The exponent s often increased with increasing the temperature, and this behavior is consistent with overlapping large-polaron tunneling model. The DC activation energy decreased when the percentage of Pb3O4 increased to 3.0 wt% and then increased at 4.0 wt%. Additionally, a convergence between these values and the activation energies of α and β relaxations observed, which is indicates that the same type of charge carriers participate in the processes.

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