Details

Autor(en) / Beteiligte

• Tuller, H.L.
• Bishop, S.R.
• Chen, D.
• Kuru, Y.
• Kim, J.-J.
• Stefanik, T.S.

Titel

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

Ist Teil von

• Solid state ionics, 2012-10, Vol.225, p.194-197

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.