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.
Structural characterization of Tb-and Pr-doped ceria / M. Coduri, M. Scavini, M. Brunelli, P. Masala, E. Pedrazzin. - In: SOLID STATE IONICS. - ISSN 0167-2738. - 268 A(2014), pp. 150-155. [10.1016/j.ssi.2014.10.020]
Structural characterization of Tb-and Pr-doped ceria
M. CoduriPrimo
;M. ScaviniSecondo
;P. MasalaPenultimo
;
2014
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 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.
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