Praseodymium doped ceria: Model mixed ionic electronic conductor with coupled electrical, optical, mechanical and chemical properties

Praseodymium doped ceria: Model mixed ionic electronic conductor with coupled electrical, optical, mechanical and chemical properties

Praseodymium doped ceria, PrxCe1−xO2−δ (PCO), exhibits many interesting and unusual properties including a pO2 dependent ionic conductivity, an anomalously large thermal expansion coefficient in air, and a significant electronic conductivity component at elevated pO2. These unusual features are disc...

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Bibliographic Details
Published in:Solid state ionics Vol. 225; pp. 194 - 197
Main Authors: Tuller, H.L., Bishop, S.R., Chen, D., Kuru, Y., Kim, J.-J., Stefanik, T.S.
Format: Journal Article
Language:English
Published: Elsevier B.V 04-10-2012
Subjects:
Cathode
Cerium oxide
Chemical expansion
Conductors (devices)
Electronics
Elevated
Mixed conductor
Nonstoichiometry
Optical absorption
Praseodymium
Resistivity
SOFC
Solid electrolytes
Thermal expansion
Mixed conductor
Cathode
Optical absorption
Nonstoichiometry
Chemical expansion
SOFC
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Summary:Praseodymium doped ceria, PrxCe1−xO2−δ (PCO), exhibits many interesting and unusual properties including a pO2 dependent ionic conductivity, an anomalously large thermal expansion coefficient in air, and a significant electronic conductivity component at elevated pO2. These unusual features are discussed in terms of the variable valent nature of Pr at elevated pO2, its position within the ceria band gap and the creation of an impurity band supporting small polaron transport. Implications for use of PCO as a ceria solid electrolyte compatible cathode, stress induced chemical expansion and optically detected redox kinetics are analyzed and discussed. ► Summary of optical, electrical, and mechanical properties of Pr doped ceria. ► Mixed conductivity in SOFC cathode conditions from Pr. ► Optical absorption from impurity band allows kinetics monitoring. ► Chemical expansion from nonstoichiometry results in large effective thermal expansion.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2012.02.029