Critical role of annealing atmosphere on solid solution formation between PrO2-δ and ThO2

Activation of small molecules over praseodymium-doped ceria

“…This difference can be explained by a resonance Compared with the visible Raman results, the 325 nm excited UV Raman shows a band centered at 590 cm -1 rather than 570 cm -1 and the peak area ratio of the bands at 590 and 460 cm -1 is further increased to 6.7. For Pr/CeO2, the band around 570-590 cm -1 might be related to the intrinsic defects of CeO2 (590 cm -1 ), the Pr 3+ induced oxygen vacancy (570 cm -1 ) and the vibration of the Pr-O species around 550 cm -1 [31]. Due to complexities of the band and the resonance Raman effect (resulting in different peak area ratios between the band at 570-590 and 455 cm -1 for different laser lines), the amount of the defects cannot be directly calculated by Raman results.…”