Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides
AbstractIn 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
Share & Cite This Article
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.
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(14):2219.Chicago/Turabian Style
Lesnichyova, Alyona; Stroeva, Anna; Belyakov, Semyon; Farlenkov, Andrey; Shevyrev, Nikita; Plekhanov, Maksim; Khromushin, Igor; Aksenova, Tatyana; Ananyev, Maxim; Kuzmin, Anton. 2019. "Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides." Materials 12, no. 14: 2219.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.