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In this paper, effect of Gd3+ was investigated on structural, magnetic, and dielectric properties of Mn0.5Zn0.5GdxFe2–xO4 (x = 0, 0.025, 0.050, 0.075, and 0.1) nanoparticles prepared by facile coprecipitation method. X-ray diffraction (XRD) studies confirmed the single cubic spinel phase for all the samples and showed that lattice parameter (aexp) was found to increase from 8.414 to 8.446 Å with the substitution of Gd3+ ions due to their larger ionic radii than the replaced Fe3+ ions. Shape and size of developed nanoparticles were studied using transmission electron microscopy (TEM) and found that particle size decreased from 31.06 to 21.12 nm for x = 0–0.1. Magnetic properties showed that maximum magnetization decreased from 39.21 to 23.59 emu/g, and Curie temperature decreased from 192 to 176 ℃ with increase in x from 0 to 0.1 due to weakening of superexchange interaction. Dielectric parameters like dielectric constant ( εand ε), dielectric loss (tanδ), AC conductivity (σac), and impedance ( Zand Z) as a function of frequency and composition were analyzed and discussed. It was found that ε, ε, σac, and tanδ values decreased with Gd substitution, which has been explained based on Maxwell–Wagner theory and hopping mechanism of electrons between Fe3+ and Fe2+ ions at octahedral sites. Nyquist plots for all the developed compositions showed single semi-circular arc which indicate the dominant effect of grain boundaries.


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Structural, thermomagnetic, and dielectric properties of Mn0.5Zn0.5GdxFe2–xO4 (x = 0, 0.025, 0.050, 0.075, and 0.1)

Show Author's information Lakshita PHORVinod KUMAR( )
Hydrogen Lab, Department of Physics, DCR University of Science and Technology, Murthal-131039, Haryana, India

Abstract

In this paper, effect of Gd3+ was investigated on structural, magnetic, and dielectric properties of Mn0.5Zn0.5GdxFe2–xO4 (x = 0, 0.025, 0.050, 0.075, and 0.1) nanoparticles prepared by facile coprecipitation method. X-ray diffraction (XRD) studies confirmed the single cubic spinel phase for all the samples and showed that lattice parameter (aexp) was found to increase from 8.414 to 8.446 Å with the substitution of Gd3+ ions due to their larger ionic radii than the replaced Fe3+ ions. Shape and size of developed nanoparticles were studied using transmission electron microscopy (TEM) and found that particle size decreased from 31.06 to 21.12 nm for x = 0–0.1. Magnetic properties showed that maximum magnetization decreased from 39.21 to 23.59 emu/g, and Curie temperature decreased from 192 to 176 ℃ with increase in x from 0 to 0.1 due to weakening of superexchange interaction. Dielectric parameters like dielectric constant ( εand ε), dielectric loss (tanδ), AC conductivity (σac), and impedance ( Zand Z) as a function of frequency and composition were analyzed and discussed. It was found that ε, ε, σac, and tanδ values decreased with Gd substitution, which has been explained based on Maxwell–Wagner theory and hopping mechanism of electrons between Fe3+ and Fe2+ ions at octahedral sites. Nyquist plots for all the developed compositions showed single semi-circular arc which indicate the dominant effect of grain boundaries.

Keywords:

spinel ferrite, coprecipitation method, structural property, magnetism, dielectric property
Received: 22 November 2019 Revised: 14 January 2020 Accepted: 23 January 2020 Published: 23 March 2020 Issue date: April 2020
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Publication history

Received: 22 November 2019
Revised: 14 January 2020
Accepted: 23 January 2020
Published: 23 March 2020
Issue date: April 2020

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