Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function
As transport properties of doped ceria electrolytes depend significantly on the nature of the dopant and the defectivity, the design of new materials and devices requires proper understanding of the defect structure. Among lanthanide dopants, Yb shows some peculiar characteristics that call for a po...
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| Format: | Article |
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MDPI AG
2019-08-01
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| Series: | Inorganics |
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| Online Access: | https://www.mdpi.com/2304-6740/7/8/102 |
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| author | Mauro Coduri Dario Bozzetti Stefano Checchia Michela Brunelli Marco Scavini |
| author_facet | Mauro Coduri Dario Bozzetti Stefano Checchia Michela Brunelli Marco Scavini |
| author_sort | Mauro Coduri |
| collection | DOAJ |
| description | As transport properties of doped ceria electrolytes depend significantly on the nature of the dopant and the defectivity, the design of new materials and devices requires proper understanding of the defect structure. Among lanthanide dopants, Yb shows some peculiar characteristics that call for a possible different defect structure compared to Gd and Sm conventional dopants, which could be linked to its poorer performance. For this purpose, we combine synchrotron and neutron powder diffraction exploiting the Rietveld and Pair distribution Function. By increasing its concentration, Yb produces qualitatively the same structural distortions as other dopants, leading to a domain structure involving the progressive nucleation and growth of nanodomains with a Yb<sub>2</sub>O<sub>3</sub>-like (C-type) structure hosted in a fluorite CeO<sub>2</sub> matrix. However, when it comes to growing the C-type nanodomains into a long-range phase, the transformation is less pronounced. At the same time, a stronger structural distortion occurs at the local scale, which is consistent with the segregation of a large amount of oxygen vacancies. The strong trapping of V<sub>O</sub>s by Yb<sup>3+</sup> explains the poor performance of Yb-doped ceria with respect to conventional Sm-, Gd-, and Y-doped samples at equal temperature and dopant amount. |
| first_indexed | 2024-12-11T09:24:07Z |
| format | Article |
| id | doaj.art-b7995a5875ff4bf092a418447706cf15 |
| institution | Directory Open Access Journal |
| issn | 2304-6740 |
| language | English |
| last_indexed | 2024-12-11T09:24:07Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
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| series | Inorganics |
| spelling | doaj.art-b7995a5875ff4bf092a418447706cf152022-12-22T01:13:11ZengMDPI AGInorganics2304-67402019-08-017810210.3390/inorganics7080102inorganics7080102Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution FunctionMauro Coduri0Dario Bozzetti1Stefano Checchia2Michela Brunelli3Marco Scavini4Dipartimento di Chimica, Università Degli Studi di Pavia, I-27100 Pavia, ItalyDipartimento di Chimica, Università di Milano, I-20133 Milano, ItalyESRF, European Synchrotron Radiation Facility, F-38043 Grenoble, FranceDUBBLE CRG at the ESRF, Netherlands Organisation for Scientific Research (NWO), F-38043 Grenoble, FranceDipartimento di Chimica, Università di Milano, I-20133 Milano, ItalyAs transport properties of doped ceria electrolytes depend significantly on the nature of the dopant and the defectivity, the design of new materials and devices requires proper understanding of the defect structure. Among lanthanide dopants, Yb shows some peculiar characteristics that call for a possible different defect structure compared to Gd and Sm conventional dopants, which could be linked to its poorer performance. For this purpose, we combine synchrotron and neutron powder diffraction exploiting the Rietveld and Pair distribution Function. By increasing its concentration, Yb produces qualitatively the same structural distortions as other dopants, leading to a domain structure involving the progressive nucleation and growth of nanodomains with a Yb<sub>2</sub>O<sub>3</sub>-like (C-type) structure hosted in a fluorite CeO<sub>2</sub> matrix. However, when it comes to growing the C-type nanodomains into a long-range phase, the transformation is less pronounced. At the same time, a stronger structural distortion occurs at the local scale, which is consistent with the segregation of a large amount of oxygen vacancies. The strong trapping of V<sub>O</sub>s by Yb<sup>3+</sup> explains the poor performance of Yb-doped ceria with respect to conventional Sm-, Gd-, and Y-doped samples at equal temperature and dopant amount.https://www.mdpi.com/2304-6740/7/8/102doped ceriaX-ray and neutron power diffractionpair distribution functionlocal structurenanodomains |
| spellingShingle | Mauro Coduri Dario Bozzetti Stefano Checchia Michela Brunelli Marco Scavini Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function Inorganics doped ceria X-ray and neutron power diffraction pair distribution function local structure nanodomains |
| title | Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function |
| title_full | Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function |
| title_fullStr | Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function |
| title_full_unstemmed | Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function |
| title_short | Local and Average Structure of Yb-Doped Ceria through Synchrotron and Neutron Pair Distribution Function |
| title_sort | local and average structure of yb doped ceria through synchrotron and neutron pair distribution function |
| topic | doped ceria X-ray and neutron power diffraction pair distribution function local structure nanodomains |
| url | https://www.mdpi.com/2304-6740/7/8/102 |
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