Surface chemistry of Pr-doped nanocrystalline zirconia

Agnieszka Opalińska 1,2Urszula Narkiewicz 3Eryk Lipinski 4Marcin Podsiadły 3Yuri Suchorski 5Helmut Weiss 5

1. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
3. Szczecin University of Technology, Institute of Chemical and Environment Engineering, Szczecin 70-322, Poland
4. Technical University of Szczecin, Institute of Chemical and Environment Engineering, Pulaskiego 10, Szczecin 70-322, Poland
5. Otto-von-Guericke-Universitaet Magdeburg, Chemisches Institut, Universitaetsplatz 2, Magdeburg D-39106, Germany

Abstract

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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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Agnieszka Opalińska
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-21 16:54
Revised:   2009-06-07 00:44