Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/99949
Title: Structural, morphological, Raman and ac electrical properties of the multiferroic sol-gel made Bi<inf>0.8</inf>Er<inf>0.1</inf>Ba<inf>0.1</inf>Fe<inf>0.96</inf>Cr<inf>0.02</inf>Co<inf>0.02</inf>O<inf>3</inf> material
Authors: Benali, A.
Melo, B.M.G.
Prezas, P.R.
Bejar, M.
Dhahri, E.
Valente, M.A.
Graça, M.P.F.
Nogueira, Bernardo Albuquerque 
Costa, B.F.O.
Keywords: Multiferroic; Ceramics; Impedance spectroscopy; Bismuth ferrite; Perovskite
Issue Date: 13-Oct-2018
Publisher: Elsevier
Project: FCT/MCTES/BPD/42/25492/2016 
POCI-01-0145-FEDER-007688 
UID/FIS/04564/2016 
ICT-2009-02-012-1890 
Serial title, monograph or event: Journal of Alloys and Compounds
Volume: 775
Abstract: We have investigated the effect of multi-doping in A and B site of the multiferroic prepared by the Sol-gel method Bi0.8Er0.1Ba0.1Fe0.96Co0.02Cr0.02O3 (BEBFCC) on the structural, morphological and electric properties. X-Ray diffraction and Rietveld refinement confirm that the BEBFCC compound presents a rhombohedral structure with the R3C space group. The Ac electrical properties have been measured from 331 to 735 K as a function of frequency (100 kHz - 1 MHz). Debye's theory and Arrhenius relations were used to study the relaxation phenomenon. The frequency dependence of the impedance (Z”: imaginary part) reveals the existence of one relaxation peak, while the Modulus formalism shows two peaks. The presence of two contributions, related to the dielectric relaxations visible in this compound, was confirmed by the Impedance Nyquist plots. The study of the ac conductivity based on Jonsher's power law confirms that the conduction is associated to the Non-Overlapping Small Polaron Tunneling model.
URI: http://hdl.handle.net/10316/99949
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2018.10.142
Rights: openAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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