Show simple item record

dc.contributor.authorBurriel, Mónica
dc.contributor.authorPeña-Martínez, Juan
dc.contributor.authorChater, Richard J.
dc.contributor.authorFearn, Sarah
dc.contributor.authorBerenov, Andrey V.
dc.contributor.authorSkinner, Stephen J.
dc.contributor.authorKilner, John A.
dc.date.accessioned2016-02-25T12:42:20Z
dc.date.available2016-02-25T12:42:20Z
dc.date.issued2012-02-14
dc.identifier.citationBurriel M, Peña-Martínez J, Chater RJ, Fearn S, Berenov AV, et al. (2012) Anisotropic Oxygen Ion Diffusion in Layered PrBaCo 2 O 5+δ . Chem Mater 24: 613–621. Available: http://dx.doi.org/10.1021/cm203502s.
dc.identifier.issn0897-4756
dc.identifier.issn1520-5002
dc.identifier.doi10.1021/cm203502s
dc.identifier.urihttp://hdl.handle.net/10754/597574
dc.description.abstractOxygen diffusion and surface exchange coefficients have been measured on polycrystalline samples of the double perovskite oxide PrBaCo 2O 5+δ by the isotope exchange depth profile method, using a time-of-flight SIMS instrument. The measured diffusion coefficients show an activation energy of 1.02 eV, as compared to 0.89 eV for the surface exchange coefficients in the temperature range from 300 to 670 °C. Inhomogeneity was observed in the distribution of the oxygen-18 isotopic fraction from grain to grain in the ceramic samples, which was attributed to anisotropy in the diffusion and exchange of oxygen. By the use of a novel combination of electron back scattered diffraction measurements, time-of-flight, and focused ion beam SIMS, this anisotropy was confirmed by in-depth analysis of single grains of known orientation in a ceramic sample exchanged at 300 °C. Diffusion was shown to be faster in a grain oriented with the surface normal close to 100 and 010 (ab-plane oriented) than a grain with a surface normal close to 001 (c-axis oriented). The magnitude of this anisotropy is estimated to be close to a factor of 4, but this is only a lower bound due to experimental limitations. These findings are consistent with recent molecular dynamic simulations of this material where anisotropy in the oxygen transport was predicted. © 2012 American Chemical Society.
dc.description.sponsorshipThis research was supported by a Marie Curie Intra European Fellowship within the seventh European Community Framework Programme (PIEF-GA-2009-252711) and by KAUST (King Abdullah University of Science and Technology) Academic Excellence Alliance (for M.B). J.P.-M. acknowledges financial support from the Spanish Government through the "Juan de la Cierva" and "Jose Castillejo" fellowship programs.
dc.publisherAmerican Chemical Society (ACS)
dc.subjectanisotropy
dc.subjectcathodes
dc.subjectdouble perovskites
dc.subjectlayered cobaltites
dc.subjectmixed conductors (MIEC)
dc.subjectoxygen diffusion
dc.subjectsolid oxide fuel cells (SOFC)
dc.titleAnisotropic Oxygen Ion Diffusion in Layered PrBaCo 2 O 5+δ
dc.typeArticle
dc.identifier.journalChemistry of Materials
dc.contributor.institutionImperial College London, London, United Kingdom
dc.contributor.institutionUniversidad Complutense de Madrid, Madrid, Spain
kaust.grant.programAcademic Excellence Alliance (AEA)


This item appears in the following Collection(s)

Show simple item record