Study of relaxations in epoxy polymer by thermally stimulated depolarization current (TSDC) and dielectric relaxation spectroscopy (DRS)

Smaoui, Hichem; Arous, M.; Guermazi, H.; Agnel, S.; Toureille, A.

doi:10.1016/j.jallcom.2009.09.116

Cited by 40 publications

(14 citation statements)

References 33 publications

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“…Further, with the increase in the temperature, the real relative permittivity and loss tangent of both virgin and gamma-irradiated specimens were found to be increased. Smaoui et al have indicated that, the dielectric permittivity and dielectric loss factor of epoxybased polymeric material, become strongly dependent on the temperature at lower frequencies and reach higher values at high temperatures, due to DC conductivity effect [41]. Similar characteristics are observed here, with the epoxy specimens having higher rate of increase in permittivity and loss tangent values with respect to temperature, at lower frequencies compared to higher frequencies.…”

Section: Dielectric Response Spectroscopysupporting

confidence: 83%

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

et al. 2020

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Epoxy nano-micro composite specimen prepared with micro silica and ion trapping nanoparticle, by shear mixing process, was exposed to gamma radiation and its performance for space charge and charge trap characteristics were analysed. The threshold for space charge accumulation of epoxy nanocomposites reduces and rate of space charge accumulation increases with an increase in dosage of gamma irradiation. The average growth of space charge density during poling and charge decay rate during depoling are relatively higher for gamma-irradiated specimens than the virgin specimen. The initial surface potential has a marginal reduction with increase in the dosage of gamma radiation, but the surface potential decay rate has increased significantly. Trap distribution characteristics indicate more number of shallow traps and increase in charge mobility after irradiation. The relative permittivity and loss tangent of the specimens have high impact due to gamma irradiation. The activation energy calculated from DC conductivity by Arrhenius law reduces with increment in radiation dose. Laser-induced breakdown spectroscopy reflected no change in elemental composition with gamma-irradiated specimen. The variation in plasma temperature and ion line to atomic line intensity ratio with dosage of gamma radiation have direct correlation to the Vickers hardness number of the specimens.

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Section: Dielectric Response Spectroscopysupporting

confidence: 83%

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

et al. 2020

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“…In previous works [25][26][27] we have studied the relaxation processes in polymers using conventional and WP TSDC measurements. Among several methods used in literature to determine activation energy of trap from experimental TSC curves, we have chose to use the initial rise [15,26,28] and curve fitting methods [26]. The obtained parameters don't converge in all cases and sometimes unrealistic values were found.…”

Section: Introductionmentioning

confidence: 99%

Thermally stimulated depolarization current and dielectric spectroscopy used to study dipolar relaxations and trap level distribution in PMMA polymer

Namouchi

Jilani

Guermazi

2015

Journal of Non-Crystalline Solids

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“…It also provides information on the activation energies and the concentration of these defects . The TSDC technique has been used as a powerful tool in numerous investigations of relaxation mechanisms in the polymer community , but it is far less utilized in the inorganic dielectrics, especially the perovskite‐type glass‐ceramics.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation investigations in barium strontium titanate glass-ceramics: Thermally stimulated depolarization current technique

Zhao

Zhang

et al. 2014

Phys. Status Solidi A

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Different dielectric relaxation processes in barium strontium titanate glass‐ceramics have been investigated using the thermally stimulated depolarization current (TSDC) technique. The TSDC results obtained from the glass‐ceramics polarized under various polarization conditions show the presence of two peaks designated as A and B in ascending order of temperature, respectively. The peak A is determined to be of dipole origin and assumed to be associated with a defect complex. In addition, the peak B is due to space‐charge polarization arising from the interface between the crystalline phases and the glass matrix. It is supposed to be associated with the relaxation of oxygen vacancies. The TSDC characteristics demonstrate that the degree of crystallinity in glass‐ceramics is a predominant factor in deciding the features of dielectric relaxation mechanisms. TSDC plots for the BST glass‐ceramic samples sintered at various temperatures with the same polarization conditions.

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Study of relaxations in epoxy polymer by thermally stimulated depolarization current (TSDC) and dielectric relaxation spectroscopy (DRS)

Cited by 40 publications

References 33 publications

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

Thermally stimulated depolarization current and dielectric spectroscopy used to study dipolar relaxations and trap level distribution in PMMA polymer

Dielectric relaxation investigations in barium strontium titanate glass-ceramics: Thermally stimulated depolarization current technique

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