Influence of B-site cations ordering on magnetization and dielectric relaxations in Li–Ni spinel ferrites

Manzoor, Alina and Khan, Muhammad Azhar and Shahzad, Aamir and Al-Muhimeed, Tahani I. and AlObaid, Abeer A. and Albalawi, Hind and Afzal, Amir Muhammad and Kashif, Muhammad and Tahir, Sofia and Munir, Tariq (2021) Influence of B-site cations ordering on magnetization and dielectric relaxations in Li–Ni spinel ferrites. Ceramics International. ISSN 02728842

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Abstract

Ho-substituted Li–Ni ferrites with composition L i1.2Ni0.4HoxFe2-xO4; 0≤ x ≤ 0.15 were synthesized by a selfignited
sol-gel process. An annealing temperature of 950 ◦C is estimated via thermal-gravimetric (TGA) analysis.
X-ray diffraction (XRD) scans have confirmed the formation of the ferrite phase with a spinel structure in all
samples. Substitution of Ho ions on the B-site significantly reduced the porosity from 38 -to 23% and the
crystallite size from 23.4 -to 21.7 nm. Microstructural analysis revealed a denser structure with an increase
in Ho content. Dielectric results showed that both the dielectric loss and dielectric constant depict
a nonlinear variation with the addition of Ho. Complex impedance behavior with a single semicircle for all
samples suggests the predominant effect of the grain boundary mechanism. The substitution of Ho ions in place
of Fe ions significantly decreased the electrical conductivity. The anisotropic Ho3+ ions reinforce the L-S coupling
which consequently enhanced the coercive force from 145 -to 389 Oe, and thus the anisotropy constant.

Item Type:	Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Engineering and Applied Sciences (FEAS) > Department of Basic Sciences Islamabad
Depositing User:	Dr Amir Muhammad Afzal
Date Deposited:	07 Jul 2021 07:33
Last Modified:	07 Jul 2021 07:33
URI:	http://research.riphah.edu.pk/id/eprint/1521

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