The ionic conductivity of Sm‐doped ceria

Koettgen, Julius; Martin, Manfred

doi:10.1111/jace.17066

Title: The ionic conductivity of Sm‐doped ceria

Journal Article · 09 March 2020 · Journal of the American Ceramic Society

DOI: https://doi.org/10.1111/jace.17066 · OSTI ID:1603718

^[1];

^[2]

Institute of Physical Chemistry RWTH Aachen University Aachen Germany, JARA‐HPC Forschungszentrum Jülich and RWTH Aachen University Aachen Germany, Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA, Department of Materials Science and Engineering University of California Berkeley CA USA
Institute of Physical Chemistry RWTH Aachen University Aachen Germany, JARA‐HPC Forschungszentrum Jülich and RWTH Aachen University Aachen Germany, Helmholtz‐Institut Münster (IEK‐12) Forschungszentrum Jülich GmbH Münster Germany, JARA‐Energy Forschungszentrum Jülich and RWTH Aachen University Aachen Germany

Abstract The oxygen ion conductivity of polycrystalline samples of Sm‐doped ceria and of Gd‐doped ceria is studied as a function of doping fraction and temperature using impedance spectroscopy allowing the separation of bulk and grain boundary conductivity. The introduction of a fine spacing for the Sm dopant fraction allows the clear identification of the dopant fraction leading to the largest bulk conductivity. At 267°C, the largest bulk conductivity is shown for Ce _0.93 Sm _0.07 O _1.965 . With increasing temperature, indications of an increase in the dopant fraction, which leads to the maximum in conductivity, are found. For the grain boundary conductivity, the maximum appears at larger dopant fractions compared to the bulk conductivity. The largest total conductivity for both dopants is again found for Sm‐doped ceria. In literature, different syntheses and sample preparation methods led to larger total conductivities for Gd‐doped ceria. In this work, we demonstrate that the variation of sintering conditions leads to scattering in the conductivity over one order of magnitude. Finally, we demonstrate that, in nominally pure cerium oxide, impurities dominate the ionic conductivity.

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Sponsoring Organization:: USDOE

OSTI ID:: 1603718

Alternate ID(s):: OSTI ID: 1603720

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 103 Journal Issue: 6; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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