The ionic conductivity of Sm‐doped ceria
Abstract
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.
- Authors:
-
[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
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1603718
- Alternate Identifier(s):
- OSTI ID: 1603720
- Resource Type:
- Published Article
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Name: Journal of the American Ceramic Society Journal Volume: 103 Journal Issue: 6; Journal ID: ISSN 0002-7820
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Koettgen, Julius, and Martin, Manfred. The ionic conductivity of Sm‐doped ceria. United States: N. p., 2020.
Web. doi:10.1111/jace.17066.
Koettgen, Julius, & Martin, Manfred. The ionic conductivity of Sm‐doped ceria. United States. https://doi.org/10.1111/jace.17066
Koettgen, Julius, and Martin, Manfred. Mon .
"The ionic conductivity of Sm‐doped ceria". United States. https://doi.org/10.1111/jace.17066.
@article{osti_1603718,
title = {The ionic conductivity of Sm‐doped ceria},
author = {Koettgen, Julius and Martin, Manfred},
abstractNote = {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.},
doi = {10.1111/jace.17066},
journal = {Journal of the American Ceramic Society},
number = 6,
volume = 103,
place = {United States},
year = {Mon Mar 09 00:00:00 EDT 2020},
month = {Mon Mar 09 00:00:00 EDT 2020}
}
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