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Issue 44, 2018
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Ionic conductivity and local structural features in Ce1−xSmxO2−x/2

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Abstract

Sm-Doped ceria is one of the most promising materials to be used as electrolyte in solid oxide fuel cells due to its remarkable ionic conductivity values in the intermediate temperature range. Transport properties and local structural features of Ce1−xSmxO2−x/2 (0.1 ≤ x ≤ 0.7) were studied by an impedance/μ-Raman spectroscopy coupled approach up to 1073 K. Results suggest that C-based nanosized defect clusters are responsible for the drop in ionic conductivity observed even at x = 0.2, i.e. at a Sm content lower than necessary to allow C domains to reach the percolation threshold through crystallites. Moreover, within the fluorite-type compositional region, with increasing the Sm content, defect clusters undergo a rearrangement resulting in the enlargement of C-based domains rather than in the increase of their number; at higher x, on the contrary, both the size and amount of C domains increase in parallel.

Graphical abstract: Ionic conductivity and local structural features in Ce1−xSmxO2−x/2

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Publication details

The article was received on 02 Jul 2018, accepted on 23 Oct 2018 and first published on 23 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP04186E
Citation: Phys. Chem. Chem. Phys., 2018,20, 28338-28345
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    Ionic conductivity and local structural features in Ce1−xSmxO2−x/2

    S. Presto, C. Artini, M. Pani, M. M. Carnasciali, S. Massardo and M. Viviani, Phys. Chem. Chem. Phys., 2018, 20, 28338
    DOI: 10.1039/C8CP04186E

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