Effect of aluminum substitution on structural and magnetic properties of nickel ferrites: Raman and 57Fe IFNMR studies

Manjunatha, M and Reddy, GS and Mallikarjunaiah, KJ and Ramesh, KP and Bhat, SV (2022) Effect of aluminum substitution on structural and magnetic properties of nickel ferrites: Raman and 57Fe IFNMR studies. In: Ceramics International .

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Abstract

We present the structural and magnetic characteristics of Al substituted nickel ferrites NiFe2-AlxO4 (x = 0.0–0.3) produced through auto combustion. The phase purity and lattice parameters are determined using X-ray diffraction measurements and rietveld refinement analysis respectively. Magnetic investigations demonstrate that when the Al3+ concentration increases, the saturation magnetization (MS) decreases. Raman investigations revealed that the peaks corresponding to the A and B-site sites intensified as a result of Al3+ replacement. Furthermore, 57Fe Nuclear Magnetic Resonance investigations show that after Al3+ replacement, the centre frequencies corresponding to the A- and B-sites shift to lower frequency levels. The Fe site occupancies at the A and B sites are calculated using the findings of XRD, Raman, and NMR experiments, all of which are concurrent with each other. Based on present findings, Al3+ preferentially occupies the B-site over the A-site in nickel ferrite. © 2022 Elsevier Ltd and Techna Group S.r.l.

Item Type:	Journal Article
Publication:	Ceramics International
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Aluminum; Ferrite; Ferrites; Iron compounds; Nickel oxide; Rietveld refinement; Saturation magnetization, 57fe IFNMR; Aluminum substitutions; Auto combustion; Nickel ferrite; Phase purity; Raman investigations; Structural and magnetic characteristics; Structural and magnetic properties; VSM; X-ray diffraction measurements, Nuclear magnetic resonance spectroscopy
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Jun 2022 05:55
Last Modified:	06 Jun 2022 05:55
URI:	https://eprints.iisc.ac.in/id/eprint/73142

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