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

Autor: Andrey S. Farlenkov, Tatyana Aksenova, Alyona Lesnichyova, Anna Yu. Stroeva, Igor Khromushin, A.V. Kuzmin, Maksim Plekhanov, Maxim V. Ananyev, Nikita A. Shevyrev, Semyon Belyakov
Rok vydání: 2019
Předmět:
THERMOGRAVIMETRIC ANALYSIS
Analytical chemistry
02 engineering and technology
Electrolyte
Conductivity
lcsh:Technology
01 natural sciences
proton conductivity and proton mobility
chemistry.chemical_compound
Impurity
PROTON ELECTROLYTES
Phase (matter)
PROTON-CONDUCTING OXIDES
Ionic conductivity
General Materials Science
LaScO3
defect structure
lcsh:QC120-168.85
WATER UPTAKE
DEFECTS
021001 nanoscience & nanotechnology
ELECTRICAL CONDUCTIVITY
DEFECT STRUCTURE
THERMODESORPTION SPECTROSCOPY
0210 nano-technology
lcsh:TK1-9971
water uptake
TRANSPORT PROPERTIES
Thermogravimetric analysis
Materials science
DEFECT STRUCTURES
REDUCING ATMOSPHERE
Oxide
PROTON MOBILITY
010402 general chemistry
CALCIUM
PROBES
LASCO3
Electrical resistivity and conductivity
PROTON CONDUCTIVITY AND PROTON MOBILITY
lcsh:Microscopy
lcsh:QH201-278.5
lcsh:T
ATMOSPHERIC TEMPERATURE
0104 chemical sciences
chemistry
lcsh:TA1-2040
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
PROTON CONDUCTIVITY
Zdroj: Materials
Volume 12
Issue 14
Materials, Vol 12, Iss 14, p 2219 (2019)
ISSN: 1996-1944
DOI: 10.3390/ma12142219
Popis: In this study, oxide materials La1&minus
xCaxScO3&minus
&alpha
(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&minus
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&minus
are compared with the properties of similar proton electrolytes, La1&minus
xSrxScO3&minus
and the possible reasons for their differences were discussed.
Databáze: OpenAIRE
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