Enabling cobalt ferrite (CoFe2O4) for low magnetic field strain responsivity through Bi3+ substitution: Material for magnetostrictive sensors

Anantharamaiah, PN and Shashanka, HM and Saha, S and Chelvane, JA and Sahoo, B (2021) Enabling cobalt ferrite (CoFe2O4) for low magnetic field strain responsivity through Bi3+ substitution: Material for magnetostrictive sensors. In: Journal of Alloys and Compounds, 877 .

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Abstract

Bismuth-substituted cobalt ferrite, CoBixFe2-xO4 (x = 0, 0.1, 0.2 and 0.3), samples with enhanced magnetostriction behavior were synthesized through a glycine-nitrate based auto-combustion route. The powders were pelletized and sintered at 1450 °C for 10 min. The presence of Bi3+ in CoFe2O4 promotes a significant grain growth. The samples with x = 0 and 0.1 are found to be phase pure with cubic spinel structure, whereas a secondary phase (Bi2O3) starts forming beyond this composition due to the low solubility limit of Bi3+ in cobalt ferrite. According to our results, the maximum strain sensitivity (dλ/dH)max for Bi-doped samples (~−1.6 × 10−9 m/A) is considerably higher than that of the parent compound (~−1 × 10−9 m/A) even at lower magnetic-fields. Our work demonstrates the strategy to enhance the strain sensitivity of magnetostrictive sensors at lower applied magnetic fields through sintering of Co-ferrite samples after Bi3+ doping.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Anisotropy; Bismuth compounds; Ferrite; Grain growth; Iron compounds; Magnetostriction; Magnetostrictive devices; Sintering, Auto combustion; Bi-substitution; Cobalt ferrites; Glycine nitrates; Low magnetic fields; Magnetostrictive sensors; Phase pure; Responsivity; Strain sensitivity; Synthesised, Cobalt
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Feb 2023 03:53
Last Modified:	22 Feb 2023 03:53
URI:	https://eprints.iisc.ac.in/id/eprint/80464

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