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Open AccessArticle

Effect of the (Nd,Dy)-Double Doping on the Structural Properties of Ceria

1
Department of Chemistry and Industrial Chemistry, University of Genova, Via Dodecaneso 31, 16146 Genova, Italy
2
Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, CNR-ICMATE, Via De Marini 6, 16149 Genova, Italy
3
Elettra-Sincrotrone Trieste S.C.p.A., ss 14, km 163.5, 34149 Basovizza, Italy
4
INSTM, Genova Research Unit, Via Dodecaneso 31, 16146 Genova, Italy
5
CNR-SPIN, Corso Perrone 24, 16152 Genova, Italy
*
Author to whom correspondence should be addressed.
Inorganics 2019, 7(8), 94; https://doi.org/10.3390/inorganics7080094
Received: 12 June 2019 / Revised: 15 July 2019 / Accepted: 23 July 2019 / Published: 26 July 2019
(This article belongs to the Special Issue Rare Earth-Doped Ceria Systems and Their Applications)
The crystallographic properties of the Ce1−x(Nd0.63Dy0.37)xO2−x/2 system (0 ≤ x ≤ 0.6) were studied by means of synchrotron powder X-ray diffraction and compared to the ones of Sm-doped ceria. The aim of this work was to investigate the effect of substituting Sm3+ by a mixture of a smaller and a larger ion that ensures a more pronounced Ce4+/dopant size mismatch while having the same average ionic size as Sm3+. Two main findings came to light: (a) the compositional region of the CeO2-based solid solution widens up to x ranging between 0.4 and 0.5, and (b) the cell parameter is larger than the one of Sm-doped ceria at each composition. Both effects are expected to play a significant role on the ionic conductivity of the material. The results are discussed in terms of disorder and cation-vacancy association. View Full-Text
Keywords: solid oxide fuel cells; doped ceria; powder X-ray diffraction; synchrotron radiation solid oxide fuel cells; doped ceria; powder X-ray diffraction; synchrotron radiation
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MDPI and ACS Style

Artini, C.; Gigli, L.; Carnasciali, M.M.; Pani, M. Effect of the (Nd,Dy)-Double Doping on the Structural Properties of Ceria. Inorganics 2019, 7, 94.

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