Publication:
Structural and dielectric properties of ultra-fast microwave-processed La_0.3Ca_0.7Fe_0.7Cr_0.3O3-delta ceramics

dc.contributor.authorSánchez Ahijón, Elena
dc.contributor.authorSchmidt, Rainer
dc.contributor.authorMartínez de Irujo Labalde, Xabier
dc.contributor.authorHaris Masood, Ansari
dc.contributor.authorFernández Díaz, María Teresa
dc.contributor.authorMorán, Emilio
dc.contributor.authorMolero Sánchez, Beatriz
dc.contributor.authorPrado Gonjal, Jesús
dc.date.accessioned2023-06-22T12:29:04Z
dc.date.available2023-06-22T12:29:04Z
dc.date.issued2022-07-13
dc.descriptionCRUE-CSIC (Acuerdos Transformativos 2022) © 2022 The Authors. Published by Elsevier Inc. This work has been supported by the Madrid Government (Comunidad de Madrid- Spain) under the Multiannual Agreement with Complutense University in the line Program to Stimulate Research for Young Doctors in the context of the V PRICIT (Regional Programme of Research and Technological Innovation): Project PR65/19–22459. We thank to Spanish Ministry for Science and Innovation (MCIN/AEI/10.13039/ 501100011033) for granting the projects PID2020-112848RB-C21 and RTI2018-094550-A-I00. We also wish to express our gratitude to the ILL and CNME technical staff for providing the facilities for neutron poder diffraction experiment and SEM, respectively.
dc.description.abstractPerovskite La_0.3Ca_0.7Fe_0.7Cr_0.3O_(3-delta) (LCFCr) is a mixed ionic and electronic conductor (MIEC) that can be employed as an electrode material in reversible solid oxide fuel cells (RSOFCs). In this work, an ultra-fast (15 min) one-step microwave (MW)-assisted combustion synthesis route has been developed to obtain phase pure and highly crystalline LCFCr powder. The synthesized powders exhibited a sponge-like microstructure with increased electrochemical reaction sites. Neutron thermodiffraction analysis revealed a structural transition above 500 degrees C from the room temperature (RT) orthorhombic Pnma to a rhombohedral R3c perovskite phase. The oxygen vacancy concentration was found to increase from delta = 0.272(7) at RT to delta = 0.333(5) at 900 degrees C. Furthermore, a 3-dimensional G-type antiferromagnetic structure was detected at RT. MW-sintering of pressed green ceramic pellets was carried out at 950 degrees C for 1 h, using a MW-transparent quartz fiber crucible or alternatively a SiC crucible acting as a MW-absorber. Impedance spectroscopy data on sintered ceramic pellets revealed electronic inhomogeneity as demonstrated by the occurrence of three dielectric relaxation processes associated with two grain boundary (GB)-like contributions and one bulk. The dielectric inhomogeneity encountered may be restricted to the extrinsic GB areas, which may be rather thin. More homogeneous dielectric properties of the GBs were found in the pellet that was sintered in the SiC crucible.
dc.description.departmentDepto. de Física de Materiales
dc.description.departmentDepto. de Química Inorgánica
dc.description.facultyFac. de Ciencias Físicas
dc.description.facultyFac. de Ciencias Químicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN) / FEDER
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.sponsorshipComunidad de Madrid / Universidad Complutense de Madrid (UCM)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/75504
dc.identifier.doi10.1016/j.jssc.2022.123426
dc.identifier.issn0022-4596
dc.identifier.officialurlhttp://dx.doi.org/10.1016/j.jssc.2022.123426
dc.identifier.urihttps://hdl.handle.net/20.500.14352/72643
dc.journal.titleJournal of solid state chemistry
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDRTI2018-094550-A-I00
dc.relation.projectIDPID2020-112848RB-C21
dc.relation.projectIDQ (PR65/19–22459)
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.cdu538.9
dc.subject.keywordAir electrode
dc.subject.keywordcathode
dc.subject.keywordCells
dc.subject.keywordCO_2
dc.subject.keywordMicrowave synthesis
dc.subject.keywordMicrowave sintering
dc.subject.keywordPerovskite
dc.subject.keywordReversible solid oxide fuel cells
dc.subject.keywordNeutron powder diffraction
dc.subject.keywordImpedance spectroscopy
dc.subject.ucmFísica de materiales
dc.subject.ucmFísica del estado sólido
dc.subject.unesco2211 Física del Estado Sólido
dc.titleStructural and dielectric properties of ultra-fast microwave-processed La_0.3Ca_0.7Fe_0.7Cr_0.3O3-delta ceramics
dc.typejournal article
dc.volume.number314
dspace.entity.typePublication
relation.isAuthorOfPublicationd20ad14d-1b00-4f7b-9e91-a33eec6b0529
relation.isAuthorOfPublication4d468566-fa66-4e1c-8463-382517edca6e
relation.isAuthorOfPublication.latestForDiscoveryd20ad14d-1b00-4f7b-9e91-a33eec6b0529
Files
Original bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
SCHMIDT, R 07 OA+CC(nc-nd).pdf
Size:
2.7 MB
Format:
Adobe Portable Document Format
No Thumbnail Available
Name:
Sánchez-Ahijón et al. J.Solid State Chem. 314 (2022) p123426 Supplementary Information.pdf
Size:
1.1 MB
Format:
Adobe Portable Document Format
Collections