Nanopowders of zirconia doted with praseodymium were obtained by microwave assisted hydrothermal synthesis. The standard wet precipitation method was used as well to study the precipitation process. The XRD spectra of samples prepared using both methods were compared. Zirconium hydroxide precipitates at lower pH than praseodymium one, than a single nanoparticle of powder should be composed of a zirconia core covered by a shell of praseodymium oxide. This result was confirmed by the XPS measurements, showing the surface enrichment in praseodymium. According to the EPR studies of the nanopowders performed after the heat treatment under hydrogen, the creation of ZrO₂^-n radicals can be suggested.

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