Comparative study of the structural and magnetic properties of alpha and beta phases of lithium ferrite nanoparticles synthesized by solution combustion method

Thomas, Nygil and Shimna, Thooneri and Jithin, P V and Sudheesh, V D and Choudhary, Harish Kumar and Sahoo, Balaram and Nair, Swapna S and Lakshmi, N and Sebastian, Varkey (2018) Comparative study of the structural and magnetic properties of alpha and beta phases of lithium ferrite nanoparticles synthesized by solution combustion method. In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 462 . pp. 136-143.

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Abstract

The structural and magnetic properties of lithium ferrite nanoparticles synthesized through the solution combustion route at different fuel to oxidizer ratio are studied using different techniques. Powder X-ray diffraction studies show that the fuel to oxidizer ratio is a critical parameter that determines the phase purity and degree of order of the samples. Magnetic studies show that the saturation magnetization and coercivity are comparable to those reported for lithium ferrites prepared using other methods. Saturation magnetization of Li0.8 sample at room temperature is 60 emu/g and is close to the bulk value. The hyperfine parameters obtained from the Mossbauer spectra of Li0.6 and Li0.8 also match the reported values of phase pure samples. Mossbauer spectra of samples prepared at stoichiometric and fuel rich conditions show the presence of Fe2+ cations in the ferrite phase, indicating that a reducing environment which reduces Fe3+ to Fe2+ ions is created as the fuel to oxidizer ratio is increased. The variation in the structural and magnetic properties of the samples, combined with TGA and FTIR studies, shows that the fuel lean condition is more appropriate for the direct formation of single phase lithium ferrite nanoparticles. (C) 2018 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Publisher:	ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Additional Information:	Copy right of this article belong to ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	18 Jun 2018 14:51
Last Modified:	18 Jun 2018 14:51
URI:	http://eprints.iisc.ac.in/id/eprint/60027

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