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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F25%3APU156414" target="_blank" >RIV/00216305:26620/25:PU156414 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0925838825013647?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0925838825013647?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2025.179806" target="_blank" >10.1016/j.jallcom.2025.179806</a>

Result language

angličtina

Original language name

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

Original language description

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 concentra

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10400 - Chemical sciences

Project

<a href="/en/project/LM2023051" target="_blank" >LM2023051: Research infrastructure CzechNanoLab</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

JOURNAL OF ALLOYS AND COMPOUNDS

ISSN

0925-8388

e-ISSN

1873-4669

Volume of the periodical

1022

Issue of the periodical within the volume

179806

Country of publishing house

CH - SWITZERLAND

Number of pages

18

Pages from-to

„“-„“

UT code for WoS article

001457982300001

EID of the result in the Scopus database

2-s2.0-105000947568