Enhanced magneto-electric properties and magnetodielectric effect in lead-free (1-x)0.94Na0.5Bi0.5TiO3-0.06BaTiO3–x CoFe2O4 particulate composites

Pal, Munendra and Srinivas, Adiraj and Asthana, Saket (2022) Enhanced magneto-electric properties and magnetodielectric effect in lead-free (1-x)0.94Na0.5Bi0.5TiO3-0.06BaTiO3–x CoFe2O4 particulate composites. Journal of Alloys and Compounds, 900. pp. 1-13. ISSN 0925-8388

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Abstract

The lead-free magnetoelectric particulate composites (1-x)0.94Na0.5Bi0.5TiO3-0.06BaTiO3–x CoFe2O4 (where, x = 0, 0.15, 0.25, 0.35, 0.45) were synthesized by the solid-state sintering technique. The coexistence of piezoelectric 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 (NBBT) and ferromagnetic CoFe2O4 (CFO) phases were confirmed by structural studies. The average crystallite size and the strain produced in the composites between the interface of different phases were estimated using Williamson-Hall method. The microstructural analysis indicates that the closely dense-packed CFO grains are distributed in the NBBT matrix. The ferroelectric nature of the composites was confirmed by the polarization versus electric field hysteresis loop and found to decrease with CFO content, which is attributed to the conducting nature of CFO. The observed values of saturation (Ms), remanent (Mr) magnetization, and magnetic moment (µB) in the composites are 28.46 emu/gm, 5.01 emu/gm and 1.13 µB, respectively for the higher CFO content. The dielectric relaxation phenomena in the composites have been observed, and the enhanced dielectric constant (ε′) is explained based on the electron hopping mechanism. All composites exhibit a relaxor nature which is described by the Vogel–Fulcher relation. The magnetoelectric coupling is estimated in the composites indirectly by measuring the relative change in the dielectric constant in the presence of the external magnetic field. The estimated values of magneto-capacitance at 1 kHz frequency for 25 and 35 mol% are ~ − 5.5 and ~ − 6%, respectively, which indicate that these materials can be useful for magneto-dielectric based devices applications. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Asthana, Saket	http://orcid.org/0000-0002-6420-3304

Item Type:

Article

Additional Information:

Author SA acknowledges CSIR-EMRII (Ref. No. 0194/NS ), and SERB , Department of Science and Technology ( CRG/2020/001509 ), India to carry out this work. Author MP acknowledges the Ministry of Human Resource and Development (MHRD) , Government of India , for providing financial assistance.

Uncontrolled Keywords:

Lead-free multiferroic composite; Magnetism; Magneto-dielectric effect; Magnetoelectric coupling

Subjects:

Others > Metallurgy Metallurgical Engineering
Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

01 Jul 2022 06:47

Last Modified:

13 Jul 2022 10:19