Synthesis and electrical properties of strontium-doped lanthanum ferrite with perovskite-type structure

Paiva, José Antônio Euzébio; Daza, Paola Cristina Cajas; Rodrigues, Fernanda Amaral; Ortiz Mosquera, Jairo F.; Silva, Cosme Roberto Moreira da; Muñoz, Marly Montero; Meneses, Rodrigo Arbey Muñoz

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Campo DC	Valor	Idioma
dc.contributor.author	Paiva, José Antônio Euzébio	-
dc.contributor.author	Daza, Paola Cristina Cajas	-
dc.contributor.author	Rodrigues, Fernanda Amaral	-
dc.contributor.author	Ortiz Mosquera, Jairo F.	-
dc.contributor.author	Silva, Cosme Roberto Moreira da	-
dc.contributor.author	Muñoz, Marly Montero	-
dc.contributor.author	Meneses, Rodrigo Arbey Muñoz	-
dc.date.accessioned	2020-05-26T18:03:08Z	-
dc.date.available	2020-05-26T18:03:08Z	-
dc.date.issued	2020	-
dc.identifier.citation	PAIVA, José Antônio Euzébio et al. Synthesis and electrical properties of strontium-doped lanthanum ferrite with perovskite-type structure. Ceramics International, 2020. DOI: https://doi.org/10.1016/j.ceramint.2020.04.212. Disponível em: https://www.sciencedirect.com/science/article/pii/S0272884220311561?via%3Dihub. Acesso em; 26 maio 2020.	pt_BR
dc.identifier.uri	https://repositorio.unb.br/handle/10482/37874	-
dc.language.iso	Inglês	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Synthesis and electrical properties of strontium-doped lanthanum ferrite with perovskite-type structure	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Método de Pechini	pt_BR
dc.subject.keyword	Ferrita de lantânio dopado com estrôncio	pt_BR
dc.subject.keyword	Células a combustível de óxido sólido	pt_BR
dc.subject.keyword	Espectroscopia de impedância	pt_BR
dc.identifier.doi	https://doi.org/10.1016/j.ceramint.2020.04.212	pt_BR
dc.relation.publisherversion	https://www.sciencedirect.com/science/article/pii/S0272884220311561?via%3Dihub	pt_BR
dc.description.abstract1	In this study, we prepared strontium-doped lanthanum ferrites with the perovskite-type structure for application as solid oxide fuel cell (SOFC) cathodes. We used the Pechini method to prepare strontium-doped lanthanum ferrites with the strontium:lanthanum molar ratios of 20:80 and 40:60. The resulting doped materials were characterized using various analytical tools. The calcination process was conducted at 450 °C because above this temperature, the stabilization of mass loss occurred and no phase transformation was observed. The X-ray diffraction results confirmed the mixing of the powder phases after the calcination process and the presence of a single powder phase in the air-sintered samples. The high-resolution transmission electron microscopy results revealed the presence of agglomerated nanoparticles smaller than 20 nm in size in the samples. The electrochemical impedance spectroscopy results revealed that the sample with 20% strontium exhibited a conductivity of 3.9 × 10−3 S cm−1 at 95 °C and activation energy of 0.37 eV. In contrast, the sample with 40% strontium exhibited a conductivity of 3.5 × 10−2 S cm−1 and activation energy of 0.29 eV. These results suggest that with an increase in the strontium content, the conductivity of the samples increased, where as the activation energy of the conduction process decreased. Therefore, the ferrites synthesized in this work are potential catalysts for SOFC cathodes.	pt_BR
dc.description.unidade	Faculdade UnB Gama (FGA)	-
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