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Open AccessArticle

Complex Dielectric and Impedance Spectroscopic Studies in a Multiferroic Composite of Bi2Fe4O9-BiFeO3

Materials Science Group, HBNI, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India
Author to whom correspondence should be addressed.
Condens. Matter 2018, 3(4), 44;
Received: 4 November 2018 / Revised: 24 November 2018 / Accepted: 28 November 2018 / Published: 2 December 2018
Complex dielectric and impedance spectroscopic studies have been carried out in a detailed manner on the system comprising of Bi2Fe4O9-BiFeO3 composite particles dispersed in a α-Fe2O3 matrix as prepared using ball milling and controlled annealing treatments. This multiferroic composite is observed to exhibit a giant dielectric constant associated with a low tangent loss. A non-Debye type of relaxation has been deduced based on complex modulus analysis. Based on these studies, the important role played by bismuth ferrite nanoshell in the core-shell composite of Bi2Fe4O9-BiFeO3 is elucidated for the observed complex impedance spectroscopic properties of the system. Electron hopping across Fe2+/Fe3+ and oxygen vacancies are deduced to be playing an important role in conduction mechanisms based on activation energy analysis of the complex impedance spectroscopy results. View Full-Text
Keywords: Bi2Fe4O9; dielectric; multiferroic; composite Bi2Fe4O9; dielectric; multiferroic; composite
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Alaka, P.; Govindaraj, R. Complex Dielectric and Impedance Spectroscopic Studies in a Multiferroic Composite of Bi2Fe4O9-BiFeO3. Condens. Matter 2018, 3, 44.

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