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Praseodymium doped cerium oxide (Pr x Ce 1−x O 2−δ ; PCO) exhibits mixed ionic and electronic conductivity at relatively high oxygen partial pressures (e.g. air) and enhanced oxygen storage capacity resulting from the ready reduction/oxidation of tri- and tetra-valent Pr. A change in the redox state of Pr results in a color change of PCO, and so serves as a means of investigating...
Praseodymium doped ceria, Pr x Ce 1−x O 2−δ (PCO), exhibits many interesting and unusual properties including a pO 2 dependent ionic conductivity, an anomalously large thermal expansion coefficient in air, and a significant electronic conductivity component at elevated pO 2 . These unusual features are discussed in terms of the variable valent nature of Pr at...
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