The electrical conductivity of PrxCe1-xO2-delta (PCO) with x less than or e
qual to0.05 was examined as functions of praseodymium content (x), oxygen p
artial pressure and temperature and a defect model based on multiple oxidat
ion states of Pr was found to be consistent with the data. These results ar
e used to examine PCOs potential as an active film in gravimetric sensors.
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