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dc.contributor.author
Mariño, Carlos
dc.contributor.author
Basbus, Juan Felipe
dc.contributor.author
Alonso, José Antonio
dc.contributor.author
Troncoso, Loreto
dc.date.available
2021-11-11T04:49:35Z
dc.date.issued
2020-07
dc.identifier.citation
Mariño, Carlos; Basbus, Juan Felipe; Alonso, José Antonio; Troncoso, Loreto; Structural characterization and electrochemical properties of (La,Sr)(Al,Mg)O 4−δ perovskites; Royal Society of Chemistry; New Journal of Chemistry; 44; 27; 7-2020; 11608-11614
dc.identifier.issn
1144-0546
dc.identifier.uri
http://hdl.handle.net/11336/146642
dc.description.abstract
LaSrAl1−xMgxO4−δ (x = 0.0?0.3) layered perovskites were synthesized by a nitrate?citrate route followed by annealing in air at 1100 °C, and studied as potential electrolyte materials in solid oxide fuel cells (SOFCs). The products obtained were initially characterized by X-ray diffraction (XRD). The compounds were indexed to the I4/mmm space group with K2NiF4-type structure. Neutron powder diffraction data were collected to determine the crystallographic features. A complementary study of pellets sintered at 1400 °C was performed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), and the segregation of secondary phases rich in Sr or La was observed for Mg contents with x ≥ 0.2. It was also noticed that Mg doping preserved the sintering capability of the compounds. Thermogravimetric (TG) measurements from green powders indicated that phase formation occurred above 900 °C. The thermal expansion coefficient (TEC) values were close to 10 × 10−6 K−1, indicating that (La,Sr)(Al,Mg)O4−δ layered perovskites are compatible with other SOFC materials. The electrical properties for single-phase compounds (x = 0.0 and 0.1) were studied by electrochemical impedance spectroscopy (EIS). The total conductivity at 900 °C for x = 0.1 was σ = 1.79 mS cm−1, whereas for x = 0.0, σ = 4.94 μS cm−1. The total conductivity was three orders of magnitude higher for x = 0.1 with respect to the undoped material. The high activation energy values around 1.5 eV indicated that the transport mechanism was dominated by oxygen vacancy diffusion. The results obtained suggest that LaSrAl0.9Mg0.1O4−δ could be applied as an electrolyte in energy conversion electrochemical systems.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Royal Society of Chemistry
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
SOFC electrolyte
dc.subject
K2NiF4-type structure
dc.subject
neutron diffraction
dc.subject
ionic conductivity
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layered perovskite.
dc.subject.classification
Cerámicos
dc.subject.classification
Ingeniería de los Materiales
dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
dc.title
Structural characterization and electrochemical properties of (La,Sr)(Al,Mg)O 4−δ perovskites
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-04-28T21:57:28Z
dc.journal.volume
44
dc.journal.number
27
dc.journal.pagination
11608-11614
dc.journal.pais
Reino Unido
dc.journal.ciudad
CAMBRIDGE
dc.description.fil
Fil: Mariño, Carlos. Universidad Austral de Chile; Chile. Universidad de Santiago de Chile; Chile
dc.description.fil
Fil: Basbus, Juan Felipe. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche | Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche; Argentina
dc.description.fil
Fil: Alonso, José Antonio. Instituto de Ciencia de Materiales de Madrid; España
dc.description.fil
Fil: Troncoso, Loreto. Universidad de Santiago de Chile; Chile
dc.journal.title
New Journal of Chemistry
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://xlink.rsc.org/?DOI=D0NJ01682A
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1039/D0NJ01682A
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