Structural characterization of Tb- and Pr-doped ceria

The crystallographic structure of Tb- and Pr-doped ceria is investigated through X-ray and neutron powder diffraction, combining pair distribution function and UV-vis spectroscopy. Compared to trivalent dopants, Tb and Pr show peculiar optical and crystallographic properties: whilst Tb have a mixed...

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Bibliographic Details
Published in:Solid state ionics 2014-12, Vol.268, p.150-155
Main Authors: Coduri, Mauro, Scavini, Marco, Brunelli, Michela, Pedrazzin, Erika, Masala, Paolo
Format: Article
Language:English
Subjects:
Cerium oxide
Crystal structure
Diffraction
Dopants
Optical properties
Spectroscopy
Structural analysis
Valence
X-rays
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Summary:The crystallographic structure of Tb- and Pr-doped ceria is investigated through X-ray and neutron powder diffraction, combining pair distribution function and UV-vis spectroscopy. Compared to trivalent dopants, Tb and Pr show peculiar optical and crystallographic properties: whilst Tb have a mixed +3/+4 valence state, Pr is stable mostly in the +4 valence state up to -50% dopant concentration. For larger Pr amounts, doping promotes a fluorite to monoclinic phase transformation. A straightforward method for extracting the dopant oxidation state by the cell parameter dependence on the ionic radius is also proposed.
ISSN:0167-2738
DOI:10.1016/j.ssi.2014.10.020