摘要： • The proton-conducting oxides are successfully prepared using a sol–gel process. • Increasing the Zr content causes lattice constriction of the perovskite structure. • Increasing the Ce/Zr ratio in the oxides increased ionic conductivity. • The Zr-free Ba0.6Sr0.4Ce0.8Y0.2O3−δ is unstable in a CO2 atmosphere at 600°C. • Suitable substitution of Ce with Zr greatly improves the oxide chemical stability. Ba0.6Sr0.4Ce0.8−xZrxY0.2O3−δ (x=0–0.8) proton-conducting oxides are prepared using a sol–gel complexing process. The effects of the Ce/Zr ratio on various material properties are systematically investigated. The sintered samples show a perovskite crystal structure without impurity phases and have a rather compact interior, making them suitable for use as a fuel cell electrolyte. Increasing the Zr content in the oxides causes lattice constriction and suppresses grain growth during sintering at 1600°C. The ionic conductivity of the oxides increases with increasing Ce/Zr ratio. At 800°C, Ba0.6Sr0.4Ce0.8Y0.2O3−δ has a conductivity of as high as 0.14S/cm. However, X-ray diffraction and Raman spectroscopy evaluations show that this oxide cannot withstand a CO2 atmosphere. A suitable substitution of Ce with Zr in the structure significantly improves the chemical stability of the oxide without significantly degrading conductivity. 出版者： Kidlington: Elsevier B.V 出版日期： 2014-02-15 出處： Journal of alloys and compounds, 2014-02, Vol.586, p.S506-S510 版權： 2013 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0925-8388 識別號： EISSN: 1873-4669 識別號： DOI: 10.1016/j.jallcom.2013.01.101
