Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/103481
Title: Investigation of temperature and frequency dependence of the dielectric properties of multiferroic (La0.8Ca0.2)0.4Bi0.6FeO3 nanoparticles for energy storage application
Authors: Bougoffa, Amira
Benali, E. M.
Benali, A. 
Bejar, M.
Dhahri, E.
Graça, M. P. F.
Valente, M. A.
Otero-Irurueta, G.
Costa, B. F. O.
Issue Date: 22-Feb-2022
Project: UID/04564/ 2020 
UID/CTM/50025/2013 I3N 
Serial title, monograph or event: RSC Advances
Volume: 12
Issue: 11
Abstract: In this work we synthesized the multifunctional (La0.8Ca0.2)0.4Bi0.6FeO3 material using a sol-gel process. Structural and morphologic investigations reveal a Pnma perovskite structure at room temperature with spherical and polygonal nanoparticles. A detailed study of the temperature dependence of the dielectric and electrical properties of the studied material proves a typical FE-PE transition with a colossal value of real permittivity at 350 K that allows the use of this material in energy storage devices. Thus, the investigation of the frequency dependence of the ac conductivity proves a correlated barrier hopping (CBH) conduction mechanism to be dominant in the temperature ranges of 150-170 K; the two observed Jonscher's power law exponents, s 1 and s 2 between 180 K and 270 K correspond to the observed dispersions in the ac conductivity spectra in this temperature region, unlike in the temperature range of 250-320 K, the small polaron tunnel (NSPT) was considered the appropriate conduction model.
URI: https://hdl.handle.net/10316/103481
DOI: 10.1039/d1ra08975g
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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