Role of Mg2+and In3+substitution on magnetic, magnetostrictive and dielectric properties of NiFe2O4ceramics derived from nanopowders

Anantharamaiah, PN and Rao, BP and Shashanka, HM and Chelvane, JA and Khopkar, V and Sahoo, B (2021) Role of Mg2+and In3+substitution on magnetic, magnetostrictive and dielectric properties of NiFe2O4ceramics derived from nanopowders. In: Physical Chemistry Chemical Physics, 23 (2). pp. 1694-1705.

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Abstract

The effect of Mg2+ and In3+ substitution on the structural, magnetic, magnetostrictive and dielectric properties of NiFe2O4 samples derived through sintering of nanocrystalline ceramic powders is investigated. Namely, NiFe2O4, NiMg0.2Fe1.8O4 and NiIn0.2Fe1.8O4 nanopowders were synthesized by a tartrate-gel route followed by calcination at 500 °C, pelletization and sintering at 1200 °C for 2 h. The average particle size was found to decrease from ∼13 nm (for NiFe2O4) to ∼9 nm and ∼7 nm for as-synthesized Mg2+ and In3+ substituted NiFe2O4 samples (after calcination), respectively. However, after sintering a better grain growth occurs for the In3+ substituted sample, as confirmed through the microscopy and dielectric results. Due to the replacement of smaller Fe3+ cations by larger In3+ and Mg2+ cations at the tetrahedral (Td) and octahedral (Oh) interstitial positions, respectively, in the spinel structure of NiFe2O4, the lattice parameters increase in both the cases. The Td site occupation of In3+ leads to higher magnetization for the NiIn0.2Fe1.8O4 sample, but Oh site occupation of Mg2+ leads to lower magnetization for the NiMg0.2Fe1.8O4 sample, in comparison to the pure NiFe2O4 sample. Furthermore, the Curie temperatures (TC) and magnetocrystalline anisotropy constants (K1) for both the samples are considerably lower than the parent compound, with all the parameters being the lowest for the In3+ substituted sample because the Td occupation of non-magnetic In3+ drastically decreases the A-O-B magnetic superexchange interactions. The above alteration to the magnetic interactions alters the magnitude of maximum magnetostriction (λmax), which is explained based on the occupation of the Mg2+ and In3+ cations in our samples. The obtained magnetostriction properties of our samples are very useful for magnetostriction based sensor application.

Item Type:	Journal Article
Publication:	Physical Chemistry Chemical Physics
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry.
Keywords:	Calcination; Dielectric properties; Employment; Grain growth; Indium compounds; Magnesium compounds; Magnetization; Magnetocrystalline anisotropy; Magnetostriction; Magnetostrictive devices; Nanocrystals; Nanostructured materials; Nickel compounds; Particle size; Positive ions; Powders; Sintering, Average particle size; Interstitial positions; Magnetic interactions; Magnetocrystalline anisotropy constant; Magnetostriction properties; Nanocrystalline ceramics; Sensor applications; Superexchange interaction, Iron compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	22 Feb 2023 04:23
Last Modified:	22 Feb 2023 04:23
URI:	https://eprints.iisc.ac.in/id/eprint/80486

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