Ceria-zirconia nanoparticles doped with La or Gd: effect of the doping cation on the real structure

Vladislav A. Sadykov 1Vladimir V. Kriventsov 1Ella M. Moroz 1Yulia V. Borchert 2Dmitrii A. Zyuzin 1Vera P. Kolko 1Tatyana G. Kuznetsova 1Vyacheslav P. Ivanov 1Andrei I. Boronin 1Natalia V. Mezentseva 1Elena B. Burgina 1Julian Ross 3

1. Boreskov Institute of Catalysis (BIC), pr. akad. Lavrentieva, 5, Novosibirsk 630090, Russian Federation
2. University of Bremen, Otto-Hahn-Allee, Bremen 28359, Germany
3. University of Limerick (UL), Plassey Technological Park, Limerick 02098, Ireland


This work presents results of studies of the real structure of nanocrystalline CeO2-ZrO2 (Ce:Zr=1:1) systems prepared via Pechini route and doped with La3+ or Gd3+ cations (x up to 30 at.%). X-ray diffraction, EXAFS, UV-Vis and Raman spectroscopy were applied for the bulk characterization, while the surface features were studied by XPS and SIMS. For both systems, the increase of Ln3+ content was accompanied by the decline of domain size and increase of the specific surface area and lattice parameter of fluorite-like phases. While for bigger La3+ the system becomes bi-phasic at xLa > 10 at.%, for smaller Gd3+ cation single-phase solid solution exists within all studied range. For both systems, depletion of the surface layer by smaller Zr4+ cations was revealed, while the surface content of a doping cation is either close to that in the bulk (La) or lower (Gd). Such a spatial distribution of components results in some ordering of cations within the particle. It is reflected in different modes of rearrangement of oxygen coordination polyhedra with the Gd or La content (by EXAFS), and redistribution of the intensity of reflections in XRD patterns not conforming to a simple model with statistical distribution of oxygen vacancies. Associated variation of average Ce(Zr)-O bond strength (SIMS) appears to affect the lattice oxygen mobility. This work is in part supported by INTAS 05-1000005-7663, RFBR-CNRS 05-03-34761 Projects and Integration Project 4.15 SB RAS.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/7756 must be provided.


Related papers
  1. Raman spectroscopy of multiphonon emission process in Ni-doped PbTe
  2. Doping and structural features of the apatite-type lanthanum silicate in the La2O3–SiO2–Al2O3 and La2O3–SiO2–Fe2O3 systems
  3. Structure and functional properties of ceramic oxygen-conducting membranes
  4. Synthesis and structural peculiarities of Ce–Zr–La–O catalysts
  5. Genesis of Al-doped apatite-type nanocrystalline lanthanum silicates prepared by mechanochemical synthesis: Phase, structural and microstructural study
  6. Structural peculiarities of nanocrystalline Ce-Sm-O catalysts with Ruthenium modified surface
  7. Nanocrystalline Ce0.45Zr0.45La0.10O2-y for CH4 oxidation: characterization and the origin of improved catalytic performance
  8. Pt-supported nanocrystalline ceria-zirconia doped with La, Pr or Gd: factors controlling syngas generation in partial oxidation/autothermal reforming of methane or oxygenates

Presentation: Oral at E-MRS Fall Meeting 2006, Symposium C, by Vladislav A. Sadykov
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-14 15:53
Revised:   2009-06-07 00:44
Web science24.com
© 1998-2022 pielaszek research, all rights reserved Powered by the Conference Engine