Abstract
Praseodymia and thoria form homogeneous crystalline phases when mixed and heated to 1300 °C. The oxygen content of these phases depends on the pressure of molecular oxygen maintained during the cooling of the samples from 500 °C down to room temperature. It is noteworthy that the addition of thoria does not promote the uptake of oxygen to form more Pr(IV) compared with the case of pure praseodymia. The lattice parameters of the mixed crystal series (Pr,Th)O 2 and (Pr,Th)O 2 − x show appreciable deviations from Vegard's Rule. An attempt is made to explain this phenomenon by the ionic size effect.
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