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Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

1
Laboratory of Electrochemical Material Sciences, Institute of High-Temperature Electrochemistry, Yekaterinburg 620137, Russia
2
Institute of New Materials and Technologies, Ural Federal University, Yekaterinburg 620002, Russia
3
Institute of Chemical Engineering, Ural Federal University, Yekaterinburg 620002, Russia
4
Laboratory of Solid State Oxide Fuel Cells, Institute of High-Temperature Electrochemistry, Yekaterinburg 620137, Russia
5
Laboratory of Radiation Diffusion, Institute of Nuclear Physics, Almaty 050032, Kazakhstan
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2219; https://doi.org/10.3390/ma12142219
Received: 20 June 2019 / Revised: 1 July 2019 / Accepted: 5 July 2019 / Published: 10 July 2019
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Abstract

In this study, oxide materials La1−xCaxScO3−α (x = 0.03, 0.05 and 0.10) were synthesized by the citric-nitrate combustion method. Single-phase solid solutions were obtained in the case of calcium content x = 0.03 and 0.05, whereas a calcium-enriched impurity phase was found at x = 0.10. Water uptake and release were studied by means of thermogravimetric analysis, thermodesorption spectroscopy and dilatometry. It was shown that lower calcium content in the main phase leads to a decrease in the water uptake. Conductivity was measured by four-probe direct current (DC) and two-probe ascension current (AC) methods at different temperatures, pO2 and pH2O. The effects of phase composition, microstructure and defect structure on electrical conductivity, as well as correlation between conductivity and water uptake experiments, were discussed. The contribution of ionic conductivity of La1−xCaxScO3−α rises with decreasing temperature and increasing humidity. The domination of proton conductivity at temperatures below 500 °C under oxidizing and reducing atmospheres is exhibited. Water uptake and release as well as transport properties of La1−xCaxScO3−α are compared with the properties of similar proton electrolytes, La1−xSrxScO3−α, and the possible reasons for their differences were discussed. View Full-Text
Keywords: LaScO3; defect structure; water uptake; proton conductivity and proton mobility LaScO3; defect structure; water uptake; proton conductivity and proton mobility
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Lesnichyova, A.; Stroeva, A.; Belyakov, S.; Farlenkov, A.; Shevyrev, N.; Plekhanov, M.; Khromushin, I.; Aksenova, T.; Ananyev, M.; Kuzmin, A. Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides. Materials 2019, 12, 2219.

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