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Effects of Strontium Content on the Microstructure and Ionic Conductivity of Samarium-Doped Ceria

School of Chemistry, University of St Andrews, North Haugh St Andrews, Fife, Scotland KY16 9ST, UK
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Academic Editor: Aleksey Yaremchenko
Solids 2021, 2(3), 293-313; https://doi.org/10.3390/solids2030019
Received: 4 June 2021 / Revised: 4 August 2021 / Accepted: 5 August 2021 / Published: 10 August 2021
Due to its high oxygen ion conductivity at elevated temperatures, samarium-doped ceria (SDC) is a very promising material for application in solid state electrochemical devices and especially in the electrolytes of solid oxide fuel cells. Several prior studies have reported a further improvement in the ionic conductivity of SDC on doping with small amounts of strontium. It is suggested that strontium acts as a sintering aid—improving the microstructure of SDC—and as a scavenger of silicon impurities, decreasing its tendency to form resistive phases at grain boundaries. However, because of the range of preparation methods and the resulting differences in microstructure and silicon levels, some inconsistencies exist in the literature. Furthermore, the effect of strontium on the intrinsic (bulk) conductivity of SDC is not often discussed. To address these issues, a systematic, combined microstructural and conductivity study has been performed on a compositional series with a range of strontium contents, Ce0.8−xSm0.2SrxO2−δ (x = 0, 0.002, 0.005, 0.01, 0.02, 0.03, 0.04). A low temperature synthesis affording products with low silicon was employed. Total bulk and grain boundary conductivity data were obtained over a wide temperature range. Increasing strontium content caused a general decrease in total and intrinsic conductivity, but there was an improvement in grain boundary conductivity at the lowest strontium levels. These results were interpreted by reference to the microstructures using, among other parameters, the blocking, and normalised blocking, factors. View Full-Text
Keywords: solid oxide fuel cell; oxygen ion conductor; electrolyte; impedance spectroscopy; ceria; strontium solid oxide fuel cell; oxygen ion conductor; electrolyte; impedance spectroscopy; ceria; strontium
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MDPI and ACS Style

Sherwood, T.; Baker, R.T. Effects of Strontium Content on the Microstructure and Ionic Conductivity of Samarium-Doped Ceria. Solids 2021, 2, 293-313. https://doi.org/10.3390/solids2030019

AMA Style

Sherwood T, Baker RT. Effects of Strontium Content on the Microstructure and Ionic Conductivity of Samarium-Doped Ceria. Solids. 2021; 2(3):293-313. https://doi.org/10.3390/solids2030019

Chicago/Turabian Style

Sherwood, Toby, and Richard T. Baker 2021. "Effects of Strontium Content on the Microstructure and Ionic Conductivity of Samarium-Doped Ceria" Solids 2, no. 3: 293-313. https://doi.org/10.3390/solids2030019

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