Enhancing the magnetic characteristics of BiFeO3 nanoparticles by Ca, Ba co-doping

Bhushan, B and Das, D and Priyam, A and Vasanthacharya, NY and Kumar, S (2012) Enhancing the magnetic characteristics of BiFeO3 nanoparticles by Ca, Ba co-doping. In: MATERIALS CHEMISTRY AND PHYSICS, 135 (1). pp. 144-149.

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Abstract

Multiferroic nanoparticles (NPs) of pristine and Ca, Ba co-doped BiFeO3 were synthesized by a facile sal gel route. Co-doping was done by fixing the total dopant concentration at 5 mol% and then the relative concentrations of Ca and Ba was varied. Structural, optical and magnetic properties of the NPs were investigated using different techniques. UV-Vis absorption spectra of BiFeO3 NPs showed a substantial blue shift of similar to 100 nm (530 nm -> 430 nm) on Ca. Ba co-doping which corresponds to increase in band gap by 0.5 eV. Fe-57 Mossbauer spectroscopy confirmed that iron is present only in 3(+) valence state in all co-doped samples. The coercive field increased by 18 times for Bi0.95Ca0.01Ba0.04FeO3 samples, which is the maximum enhancement, observed amongst all the 5 mol% doped samples. At the equimolar (2.5 mol % each) concentration of co-dopants, the coercive field shows a significant enhancement of about 9 times (220 Oe -> 2014 Oe) with concomitant increase in saturation magnetization by 7 times. Thus, equimolar co-doping causes simultaneous enhancement of the twin aspects of magnetic properties thereby making them better suited for device applications. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS CHEMISTRY AND PHYSICS
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copy right for this article belongs to Elsivers Ltd
Keywords:	Nanoparticles;Multiferroic;Magnetic properties;Optical absorption
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	03 Aug 2012 05:08
Last Modified:	03 Aug 2012 05:08
URI:	http://eprints.iisc.ac.in/id/eprint/44882

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