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Functional properties of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ proton conductors where X is an alkaline earth cation

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Functional properties of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ proton conductors where X is an alkaline earth cation

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dc.contributor.author Ivanova, Mariya E es_ES
dc.contributor.author Meulenberg, Wilhelm A. es_ES
dc.contributor.author Palisaitis, Justinas es_ES
dc.contributor.author Sebold, Doris es_ES
dc.contributor.author Solis Díaz, Cecilia es_ES
dc.contributor.author Ziegner, Mirko es_ES
dc.contributor.author Serra Alfaro, José Manuel es_ES
dc.contributor.author Mayer, Joachim es_ES
dc.contributor.author Hänsel, Michael es_ES
dc.contributor.author Guillon, Olivier es_ES
dc.date.accessioned 2017-01-23T13:50:12Z
dc.date.available 2017-01-23T13:50:12Z
dc.date.issued 2015-04
dc.identifier.issn 0955-2219
dc.identifier.uri http://hdl.handle.net/10251/77232
dc.description.abstract Lanthanum niobates with general formulas of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ (X = Mg, Ca, Sr or Ba) were synthesized via the conventional solid state reaction. Specimens with relative density above 96% were produced after sintering. Structural and phase composition studies revealed predominant monoclinic Fergusonite structure for the majority of samples. SEM and TEM studies elucidated the effect of the used dopant combinations on grain growth, micro-crack formation and secondary phase formation. Results from microstructural study were correlated to the grain interior and grain boundary conductivities for selected samples (La0.99Sr0.01Nb0.99Al0.01O4−δ and La0.99Sr0.01Nb0.99Ti0.01O4−δ). The majority of co-doped niobates exhibited appreciable protonic conductivity under humid atmospheres at intermediate temperatures. Sr- or Ca-doped compounds displayed the highest total conductivities with values for LSNA equal to 6 × 10−4 S/cm and 3 × 10−4 S/cm in wet air and in wet 4% H2–Ar (900 °C), respectively. Additionally, thermal expansion was studied to complete functional characterization of co-doped LaNbO4. es_ES
dc.description.sponsorship This work was conducted thanks to the financial support by the Helmholtz Association, Initiative and Networking Fund, MEM-BRAIN Portfolio. en_EN
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation Helmholtz Association es_ES
dc.relation Initiative and Networking Fund es_ES
dc.relation MEM–BRAIN Portfolio es_ES
dc.relation.ispartof Journal of the European Ceramic Society es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Proton-conducting ceramic materials es_ES
dc.subject Hydrogen transport ceramic membranes es_ES
dc.subject Rare earth ortho-niobates es_ES
dc.subject Acceptor-doped lanthanum niobates es_ES
dc.title Functional properties of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ proton conductors where X is an alkaline earth cation es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.jeurceramsoc.2014.11.009
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.description.bibliographicCitation Ivanova, ME.; Meulenberg, WA.; Palisaitis, J.; Sebold, D.; Solis Díaz, C.; Ziegner, M.; Serra Alfaro, JM.... (2015). Functional properties of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ proton conductors where X is an alkaline earth cation. Journal of the European Ceramic Society. 35(4):1239-1253. doi:10.1016/j.jeurceramsoc.2014.11.009 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.jeurceramsoc.2014.11.009 es_ES
dc.description.upvformatpinicio 1239 es_ES
dc.description.upvformatpfin 1253 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 35 es_ES
dc.description.issue 4 es_ES
dc.relation.senia 278320 es_ES


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