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Oxygen transport studies in nanocrystalline ceria films

Published online by Cambridge University Press:  03 March 2011

Laxmikant Saraf ,
C.M. Wang ,
V. Shutthanandan ,
Y. Zhang ,
Olga Marina ,
D.R. Baer ,
S. Thevuthasan ,
P. Nachimuthu  and
D.W. Lindle
Laxmikant Saraf*
Affiliation:
W. R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
C.M. Wang
Affiliation:
W. R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
V. Shutthanandan
Affiliation:
W. R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
Y. Zhang
Affiliation:
W. R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
Olga Marina
Affiliation:
Energy Science and Technology Division, Pacific Northwest National Laboratory, Richland, Washington 99352
D.R. Baer
Affiliation:
Chemical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352
S. Thevuthasan
Affiliation:
W. R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
P. Nachimuthu
Affiliation:
Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154; and Lawrence Berkeley National Laboratory, Berkeley, California 94720
D.W. Lindle
Affiliation:
Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154
*
a)Address all correspondence to this author. e-mail: Laxmikant.Saraf@pnl.gov
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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.

Keywords

Grain boundariesIonic conductorSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 5 , May 2005 , pp. 1295 - 1299
Copyright
Copyright © Materials Research Society 2005

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