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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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