Abstract
Praseodymium cerium oxide (Pr x Ce1 − xO2 − δ) is a mixed ionic-electronic conductor with high levels of nonstoichiometry under oxidizing conditions resulting from reduction of Pr4 + to Pr3 +. Coulometric titration measurements performed on (Pr x Ce1 − xO2 − δ) with x = 0.2 are generally consistent with those derived from electrical conductivity measurements. Nevertheless, a somewhat larger degree of nonstoichiometry measured via coulometric titration implies that non-charged defect species may be significant in the system.
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