期刊
SOLID STATE IONICS
卷 268, 期 -, 页码 150-155出版社
ELSEVIER
DOI: 10.1016/j.ssi.2014.10.020
关键词
Doped ceria; Synchrotron radiation; Neutron powder diffraction; Solid oxide fuel cells; Pair Distribution Function
资金
- Fondazione CARIPLO [2010-0612]
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 similar 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. (C) 2014 Elsevier B.V. All rights reserved.
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