Effect of potassium substituted for A-site of SrCe0.95Y0.05O3 on microstructure, conductivity and chemical stability

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 tha...

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Bibliographic Details
Published in:Ceramics international 2015-03, Vol.41 (2), p.2948-2954
Main Authors: Liu, Chi, Huang, Jian-Jia, Fu, Yen-Pei, Li, Chuan, Wang, Jian-Yih, Lee, Shyong
Format: Article
Language:English
Subjects:
Atmospheres
Carbon dioxide
Ceramics
Conductivity
Corrosion resistance
Defects
Electrical properties
Microstructure
Potassium
Resistivity
Sintering
X-ray diffraction
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Summary: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.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.10.126