Oxygen transport studies in nanocrystalline ceria films

Laxmikant Saraf, C. M. Wang, V. Shutthanandan, Y. Zhang, Olga Marina, D. R. Baer, S. Thevuthasan, P. Nachimuthu, D. W. Lindle

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    Abstract

    Oxygen uptake and conductivity were measured by nuclear-reaction analysis and alternating current impedance technique at the intermediate temperature range on sol-gel grown nanocrystalline ceria films with average grain-sizes 7 nm and 38 nm synthesized at 723 and 1173 K, respectively. Higher oxygen uptake and lower ionic conductivity were observed in ceria films with ∼7-nm grain size. High permeation-assisted oxygen diffusion in nanocrystallites combined with oxygen trapping in the disordered region contributed to higher oxygen uptake. However, the lower ionic conductivity in the film resulted from the absence of long-range lattice ordering and inactive grain-boundary/ surface oxygen vacancy sites due to oxygenation. The relationship between oxygen uptake and conductivity in ceria is discussed in details by considering grain-size dependent defect density, related surface area, and enhanced oxygen mobility.

    Original languageEnglish
    Pages (from-to)1295-1299
    Number of pages5
    JournalJournal of Materials Research
    Volume20
    Issue number5
    DOIs
    Publication statusPublished - 1 May 2005

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    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Saraf, L., Wang, C. M., Shutthanandan, V., Zhang, Y., Marina, O., Baer, D. R., Thevuthasan, S., Nachimuthu, P., & Lindle, D. W. (2005). Oxygen transport studies in nanocrystalline ceria films. Journal of Materials Research, 20(5), 1295-1299. https://doi.org/10.1557/JMR.2005.0157