Publication detail

Study of the dielectric properties, relaxation mechanisms and electrical conduction mechanisms of epoxy/ α-Iron oxide nanocomposites

Alsoud, A. Al-Bashaish, SR. Shaheen, AA. Knápek, A. Mousa, MS. Sobola, D.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

In this study, the dielectric properties, relaxation mechanisms, and electrical conduction mechanisms of epoxy resin-based nanocomposites were enhanced using ferric oxide (alpha - Fe2O3) nanoparticles. Composites containing 3-12 wt% nanoparticles were analyzed for relative permittivity, impedance, modulus, alternating conductivity, activation energy, and hopping energy across a temperature range of 30-150 degrees C and frequencies of 10- 2- 106 Hz using dielectric relaxation spectroscopy. Nanoparticle dispersion and structural formation within the epoxy matrix were confirmed using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray diffraction. The results revealed that the electrical permittivity and impedance increased with temperature, whereas the conductivity, modulus, and activation energy decreased. The relaxation behavior was analyzed using the Havriliak-Negami model via WinFit software. Distinct conduction mechanisms were observed at lower filler concentrations (3-6 wt%). %) exhibited modified Non-Overlapping Small Polaron Tunneling and modified Correlated Barrier Hopping, whereas higher concentrations (9-12 wt%) transitioned to Quantum Mechanical Tunneling and modified Correlated Barrier Hopping. The results showed that the relative permittivity of the epoxy samples increased with increasing temperature. Specifically, the relative permittivity of the epoxy/ 3 wt% sample at room temperature was 3 and it increased to 12 at 150 degrees C. Additionally, a slight increase in AC conductivity was observed owing to thermal activation, with AC conductivity values increasing from 10- 8 to10-7 S/cm within the specified temperature range for the epoxy/ 12 wt% sample. Furthermore, a gradual decrease in impedance was noted as the temperature increased, with values decreasing from 1011 to109 ohm for the epoxy/ 3 wt% sample. Analysis of the Cole-Cole plots revealed a variation in the relaxation time that depended on the filler concentration, indicating a notable impact of the filler content on the dielectric relaxation behavior. These findings demonstrate the potential of epoxy-alpha-Fe2O3 composites as high-performance insulation in high-voltage applications.

Keywords

Epoxy nanocomposites; Relaxation mechanisms; Electrical conduction mechanisms; High-voltage insulation applications

Authors

Alsoud, A.; Al-Bashaish, SR.; Shaheen, AA.; Knápek, A.; Mousa, MS.; Sobola, D.

Released

10. 4. 2025

Publisher

ELSEVIER SCIENCE SA

Location

LAUSANNE

ISBN

1873-4669

Periodical

JOURNAL OF ALLOYS AND COMPOUNDS

Year of study

1022

Number

179806

State

Swiss Confederation

Pages count

URL

https://www.sciencedirect.com/science/article/pii/S0925838825013647?via%3Dihub

BibTex

@article{BUT197899,
  author="Saleh R. {Al-Bashaish} and Alexandr {Knápek} and Dinara {Sobola} and Ammar {AL Soud} and Adel Ahmad ABD-ELHAFIZ {Shaheen} and Marwan S. Mousa {Mousa}",
  title="Study of the dielectric properties, relaxation mechanisms and electrical conduction mechanisms of epoxy/ α-Iron oxide nanocomposites",
  journal="JOURNAL OF ALLOYS AND COMPOUNDS",
  year="2025",
  volume="1022",
  number="179806",
  pages="18",
  doi="10.1016/j.jallcom.2025.179806",
  issn="1873-4669",
  url="https://www.sciencedirect.com/science/article/pii/S0925838825013647?via%3Dihub"
}