Effects of dopant ions on the conductivity of Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) electrolytes

Autor: Han Pengde, Wenjie Liu, Qingle Shi, Haijun Hou, Tianjing Li, Shoucheng He
Rok vydání: 2018
Předmět:
Zdroj: Journal of Materials Science: Materials in Electronics. 29:12429-12435
ISSN: 1573-482X
0957-4522
DOI: 10.1007/s10854-018-9359-7
Popis: In this paper, the relationship between the phase purity, microstructure, conductivity and thermal expansion of the M (Al, Fe, Y and Bi) doped SDC (Ce0.8Sm0.2O1.9) electrolytes was investigated. Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) electrolytes were prepared by sol–gel auto-combustion process. From XRD analysis, the dopant ions (Al, Fe, Y and Bi) are doped in the lattice of cubic fluorite structure of SDC and no second phase is formed for Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) calcined at 700 °C for 4 h. However, the impurity phase of Ce2O3 is formed for Ce0.75Sm0.2Al0.05O1.875 sintered at 1400 °C for 4 h. Moreover, the relative densities of the samples increase after doped with Fe, Y and Bi. While Al doping cannot improve the sintering performance and decreases the density. These results are consistent with the SEM images. In addition, the grain size of Ce0.75Sm0.2Bi0.05O1.875 is the largest as indicated by SEM microstructure. More importantly, the average thermal expansion coefficient and ionic conductivity of the sintered samples improves after doped with Fe, Y and Bi, which suggests that Ce0.75Sm0.2M0.05O1.875 (M = Al, Fe, Y, Bi) can be a potential electrolyte for the IT-SOFC.
Databáze: OpenAIRE
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