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

Lakshita PHOR; Vinod KUMAR

doi:10.1007/s40145-020-0364-y

Journal of Advanced Ceramics 2020, 9(2): 243-254 https://doi.org/10.1007/s40145-020-0364-y

Research Article |

Open Access | Issue | Published: 23 March 2020

Structural, thermomagnetic, and dielectric properties of Mn_0.5Zn_0.5Gd_xFe_2–xO₄ (x = 0, 0.025, 0.050, 0.075, and 0.1)

Show Author's Information Hide Author's Information Lakshita PHOR, Vinod KUMAR(

)

Hydrogen Lab, Department of Physics, DCR University of Science and Technology, Murthal-131039, Haryana, India

Keywords:

dielectric property, magnetism, coprecipitation method, spinel ferrite, structural property

Cite this article:

PHOR L, KUMAR V. Structural, thermomagnetic, and dielectric properties of Mn_0.5Zn_0.5Gd_xFe_2–xO₄ (x = 0, 0.025, 0.050, 0.075, and 0.1). Journal of Advanced Ceramics, 2020, 9(2): 243-254. https://doi.org/10.1007/s40145-020-0364-y

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Abstract

In this paper, effect of Gd³⁺ was investigated on structural, magnetic, and dielectric properties of Mn_0.5Zn_0.5Gd_xFe_2–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 (a_exp) 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 ( $ε^{'}$ and $ε^{″}$ ), dielectric loss (tanδ), AC conductivity (σ_ac), and impedance ( $Z^{'}$ and $Z^{″}$ ) as a function of frequency and composition were analyzed and discussed. It was found that $ε^{'}$ , $ε^{″}$ , σ_ac, 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 Mn_0.5Zn_0.5Gd_xFe_2–xO₄ (x = 0, 0.025, 0.050, 0.075, and 0.1)

Show Author's information Hide Author's Information Lakshita PHOR, Vinod KUMAR(

)

Hydrogen Lab, Department of Physics, DCR University of Science and Technology, Murthal-131039, Haryana, India

Abstract

Keywords: dielectric property, magnetism, coprecipitation method, spinel ferrite, structural property

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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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