Abstract
Effect of Sr doping on the ionic conductivity of Y 2O 3-doped ceria (YDC) with the general formula of Ce 0.8Y 0.2- x Sr x O 2- δ ( x = 0, 0.05, 0.10 and 0.15) was investigated. The phase identification, microstructures, thermal expansion and ionic conductivities of samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry and AC impedance spectroscopy (IS). The results showed that the samples of co-doping with Y and Sr can result in higher ionic conductivity and lower activation energy than those of Y singly doped ceria in the temperature range of 450–750 °C. As the substitution amount of Sr for Y increased up to 25 mol% (Ce 0.8Y 0.15Sr 0.05O 2- δ ), the sample attained the optimum ionic conductivity. At 750 °C, its ionic conductivity is 4.98 × 10 −2 S cm −1, which is twice as high as that of Ce 0.8Y 0.2O 1.9. In addition, experimental results also indicated that the grain conduction dominates the total ionic conductivity.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
