Anisotropic Oxygen Ion Diffusion in Layered PrBaCo 2 O 5+δ

Handle URI:
http://hdl.handle.net/10754/597574
Title:
Anisotropic Oxygen Ion Diffusion in Layered PrBaCo 2 O 5+δ
Authors:
Burriel, Mónica; Peña-Martínez, Juan; Chater, Richard J.; Fearn, Sarah; Berenov, Andrey V.; Skinner, Stephen J.; Kilner, John A.
Abstract:
Oxygen 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.
Citation:
Burriel 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.
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
14-Feb-2012
DOI:
10.1021/cm203502s
Type:
Article
ISSN:
0897-4756; 1520-5002
Sponsors:
This 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.
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Full metadata record

DC FieldValue Language
dc.contributor.authorBurriel, Mónicaen
dc.contributor.authorPeña-Martínez, Juanen
dc.contributor.authorChater, Richard J.en
dc.contributor.authorFearn, Sarahen
dc.contributor.authorBerenov, Andrey V.en
dc.contributor.authorSkinner, Stephen J.en
dc.contributor.authorKilner, John A.en
dc.date.accessioned2016-02-25T12:42:20Zen
dc.date.available2016-02-25T12:42:20Zen
dc.date.issued2012-02-14en
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.en
dc.identifier.issn0897-4756en
dc.identifier.issn1520-5002en
dc.identifier.doi10.1021/cm203502sen
dc.identifier.urihttp://hdl.handle.net/10754/597574en
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.en
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.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectanisotropyen
dc.subjectcathodesen
dc.subjectdouble perovskitesen
dc.subjectlayered cobaltitesen
dc.subjectmixed conductors (MIEC)en
dc.subjectoxygen diffusionen
dc.subjectsolid oxide fuel cells (SOFC)en
dc.titleAnisotropic Oxygen Ion Diffusion in Layered PrBaCo 2 O 5+δen
dc.typeArticleen
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionImperial College London, London, United Kingdomen
dc.contributor.institutionUniversidad Complutense de Madrid, Madrid, Spainen
kaust.grant.programAcademic Excellence Alliance (AEA)en
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