Structural, morphological, dielectric behavior and AC conductivity of GaxFe(3-x)O4

• Published in: Journal of magnetism and magnetic materials Vol. 562; p. 169809
• Main Author: Donta, Paramesh
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2022
• Subjects: AC conductivity and quality factor; Auto combustion; Dielectric behavior; SEM; XRD; AC conductivity and quality factor; Auto combustion; SEM; XRD; Dielectric behavior
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.169809

•XRD confirmed the single cubic spinel structure.•Dielectric constant and tanδ falls with frequency and gallium substitution.•The resistivity of the samples increases with gallium substitution.•Complex electric modulus supports the non-Debye relaxation.•AC conductivity increased with frequency and temperature. GaxFe(3-x)O4 (x = 0.0, 0.04, 0.1 and 0.4) are synthesized by auto combustion method and the structural, morphological and the dielectric properties with Ga3+ ion substitution in Fe3O4 are studied. Dielectric loss (tanδ), real (ε') and imaginary (ε'') portions of dielectric constant, AC conductivity (σAC), real (Z') and imaginary (Z'') portions of impedance, real (M') and imaginary (M'') portions of electric modulus, complex electric modulus (M*) and quality factor are evaluated with frequency (20 Hz to 10 MHz) and temperature (27OC – 500 °C) using impedance analyzer. AC conductivity (σAC) decreases with Ga3+ ion substitution that can be advocated on hoping mechanism. The dielectric loss (tanδ), dielectric permittivity (ε), AC conductivity (σAC) w.r.t. temperature and frequency could be described with Maxwell-Wagner’s interfacial polarization and hopping mechanism of ferro (Fe2+& Fe3+) ions. Variation in Cole-Cole plots exhibit decrease in electrical resistivity with temperature rise. The Nyquist plots exhibit an inherent phenomenon of conduction mechanism of Ga3+ ion substituted Fe3O4.