Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1295375 | Solid State Ionics | 2014 | 6 Pages |
Abstract
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.
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Mauro Coduri, Marco Scavini, Michela Brunelli, Erika Pedrazzin, Paolo Masala,