Abstract
The chemical stability of potassium substituted for A-site of SrCe0.95Y0.05O3 specimens was examined under CO2 atmosphere treated at 600 °C and further analyzed by X-ray diffractometer to see their CO2-resisted capabilities. According to thermodynamic data, the Gibbs free energy of CeO2 was lower than that of SrCO3 at the temperature of 600 °C. Thus the formation of CeO2 might be faster than that of SrCO3 in SrCeO3- based materials under CO2 atmosphere. Unfortunately, the chemical stability of SrCe0.95Y0.05O3 materials in CO2 atmosphere was reduced with increasing potassium-substituted amount. The microstructures of Sr1-xKxCe0.95Y0.05O3 sintered specimens were identified using field emission scanning electron microscope. The conductivity in moisture H2 atmosphere (RH 30%) was increased with increasing potassium-substituted concentration. The conductivity reached a maximum of 0.0081 Scm-1 at 900 °C for Sr0.95K0.05Ce0.95Y0.05O3 sintered specimens in moisture H2 atmosphere (RH 30%). Potassium substituted for A-site of SrCe0.95Y0.05O3 could improve the conductivity but not CO2-resisted capability.
Original language | English |
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Pages (from-to) | 2948-2954 |
Number of pages | 7 |
Journal | Ceramics International |
Volume | 41 |
Issue number | 2 |
DOIs | |
State | Published - 1 Mar 2015 |
Keywords
- Ceramics
- Defects
- Electrical properties
- X-ray diffraction