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Structure Specificity of Nanocrystalline Praseodymia Doped Ceria

Published online by Cambridge University Press:  01 February 2011

Vladislav A. Sadykov ,
V.I. Voronin ,
A. N. Petrov ,
Yu. V. Frolova ,
V.V. Kriventsov ,
D.I. Kochubei ,
V. I. Zaikovskii ,
H. Borchert  and
S. Neophytides
Vladislav A. Sadykov
Affiliation:
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
V.I. Voronin
Affiliation:
Institute of Metals Physics, Ural Branch of RAS, Ekaterinburg, Russia.
A. N. Petrov
Affiliation:
Chemical Department of Ural State University, Ekaterinburg, Russia
Yu. V. Frolova
Affiliation:
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
V.V. Kriventsov
Affiliation:
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
D.I. Kochubei
Affiliation:
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
V. I. Zaikovskii
Affiliation:
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
H. Borchert
Affiliation:
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
S. Neophytides
Affiliation:
Institute of Chemical Engineering & High Temperature Processes, Patras, Greece.
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Abstract

The features of the structure of nanorystalline Ce1-xPrxO2-y system (0 ≤ × ≤ 0.5) prepared via a complex polymerized precursor (Pechini) route have been elucidated by using a combination of spectroscopic (XANES, XPS) and structural (TEM, neutron diffraction) methods. Within the studied range of composition, the structure of all samples air annealed at 500 °C corresponds to single-phase fluorite-like solid solution. The relative content of Pr3+ both in the bulk and in the surface layer appears to be as high as 20–50%. The Rietveld refinement revealed non-monotonous variation of structural parameters (lattice parameter, domain size, microstrain density, Ce-O and O-O distances) and residual lattice hydroxyls concentration with Pr content. Clustering of defects along with variation of the mean Pr cation radius/charge state and disordering of the surface layer/ domain boundaries appear to be responsible for the observed features.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF5.2.1/K5.2
Copyright
Copyright © Materials Research Society 2005

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References

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