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Study of the La₁/₂+₁/₂ₓLi₁/₂-₁/₂ₓTi₁-ₓAlₓO₃ (0 ≤ x ≤ 1) solid solution. A new example of percolative system in fast ion conductors

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dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Síntesis y Procesado de Materialeses
dc.contributor.authorSotomayor Lozano, María Eugenia
dc.contributor.authorLevenfeld Laredo, Belén
dc.contributor.authorVarez, Alejandro
dc.contributor.authorSanz, Jesús
dc.contributor.funderComunidad de Madrides
dc.contributor.funderEuropean Commissionen
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.date.accessioned2020-10-21T12:53:40Z
dc.date.available2020-10-21T12:53:40Z
dc.date.issued2017-10-05
dc.description.abstractThe synthesis by solid state reaction of new fast ion conductors with perovskite structure was carried out. The crystal structure and electric properties of the La1/2+1/2xLi1/2-1/2xTi1-xAlxO3 (0 ≤ x ≤ 1) solid solution were investigated by powder X-ray diffraction and impedance spectroscopy. All compositions of the La1/2Li1/2TiO3-LaAlO3 system, exhibited a single cubic perovskite structure (ac approximate to 3.87-3.79 angstrom; SG Pm-3m). The progressive decrease in the unit cell parameters agrees with the lower ionic radii of Al3+ in relation to Ti4+, which are allocated in the same octahedra. An upward deviation from the lineal ideal solid solution behavior described by Vegard's law was observed and it was tentatively associated with a volume excess created by solid dilution of non-isovalent cations. Structural features were deduced from Rietveld analysis of XRD patterns. Ti(Al)O6 octahedra are regular and La/vacancies are randomly distributed in A-site of the perovskite. The conductivity decreased almost four orders of magnitude with the Li content. This important decrease on the conductivity was attributed to the charge carrier (Li+) decrease and the blockade of the perovskite conduction pathways by La ions, according to a three dimensional percolative process. In consequence we present here a new example of percolative system of ionic conductors and the results confirm the important role played by effective vacant A-sites, neff = [Li] + nA, on Li conductivity of this fast ion conductors family with perovskite structure.en
dc.description.sponsorshipAuthors thank financial support received from MINECO (MAT2013-46452-C4-3-R and MAT2016-78362-C4-3-R projects), regional CAM government (MATERYENER 3CM, P2013/MIT-2753 program) and the European Commission (Program-IRSES FP7-PEOPLE Project ID: 247579 (NANOLICOM).en
dc.format.extent6es
dc.identifier.bibliographicCitationJournal of alloys and compounds, 720, Oct. 2017, Pp. 460-465en
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2017.05.278
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669 (online)
dc.identifier.publicationfirstpage460es
dc.identifier.publicationlastpage465es
dc.identifier.publicationtitleJOURNAL OF ALLOYS AND COMPOUNDSen
dc.identifier.publicationvolume720es
dc.identifier.urihttps://hdl.handle.net/10016/31262
dc.identifier.uxxiAR/0000020247
dc.language.isoenges
dc.publisherElsevier B.V.en
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/247579/NANOLICOMen
dc.relation.projectIDGobierno de España. MAT2013‐46452‐C4‐3Res
dc.relation.projectIDGobierno de España. MAT2016-78362-C4-3-Res
dc.relation.projectIDComunidad de Madrid. P2013/MIT-2753/MATERYENER 3CMes
dc.rights© 2017 Elsevier B.V. All rights reserved.en
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.en
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.ecienciaMaterialeses
dc.subject.otherX-Ray diffractionen
dc.subject.otherIonic conductionen
dc.subject.otherSolid-state electrolyteen
dc.subject.otherLi-batteriesen
dc.subject.otherPercolative phenomenaen
dc.titleStudy of the La₁/₂+₁/₂ₓLi₁/₂-₁/₂ₓTi₁-ₓAlₓO₃ (0 ≤ x ≤ 1) solid solution. A new example of percolative system in fast ion conductorsen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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