Chemical Expansion and Frozen-In Oxygen Vacancies in Pr-Doped Ceria

Author(s)
Kuru, Yener; Bishop, Sean; Kim, Jae-Jin; Yildiz, Bilge; Tuller, Harry L.
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Abstract
Doped CeO2 is a promising candidate for solid oxide fuel cell electrolyte and electrode applications because of its high ionic conductivity and reduction/oxidation behavior at intermediate temperatures. Its electronic and ionic properties and microstructural stability are of particular interest. The present study demonstrates that the large number of oxygen vacancies created in PrxCe1-xO2-δ (PCO) at elevated temperatures can be accommodated at room temperature if cooling is performed in relatively low oxygen partial pressures (i.e. P(O2) ~ 10-3 mbar). We use the temperature dependence of the chemical expansion in reduced PCO as a metric to explore this phenomenon.
Date issued
2011
URI
http://hdl.handle.net/1721.1/81873
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Journal
ECS Transactions
Publisher
Electrochemical Society
Citation
Kuru, Yener, Sean R. Bishop, Jae-Jin Kim, Bilge Yildiz, and Harry L. Tuller. “Chemical Expansion and Frozen-In Oxygen Vacancies in Pr-Doped Ceria.” ECS Transactions 35:1 (2011). p. 1131-1136. © 2011 ECS - The Electrochemical Society.
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