Synthesis and Electrical Conductivities of Sm2O3-CeO2 Systems

稀土学报(英文版), 2005, 23(2): 167-171.

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;Metallurgical and Ecological Engineering School, Beijing University of Science and Technology, Beijing 100083, China

2.School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

3.School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

4.School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

5.School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;Metallurgical and Ecological Engineering School, Beijing University of Science and Technology, Beijing 100083, China

基金项目: 国家自然科学基金(200110808)

Synthesis and Electrical Conductivities of Sm2O3-CeO2 Systems

Keywords： doped ceria

Doped Ceria nano-powders were synthesized via a Pechini-type gel rout. The specific surface area of Ce0.8Sm0.2O1.9 powder measured by the multilayer BET method is 41 m2.g-1. The electrical conductivities of Sm2O3-CeO2 systems were measured by the ac impedance technique in air at temperatures ranging from 513 to 900 ℃. Typical impedance spectra consist of two depressed semicircles at reduced measuring temperature and one depressed semicircle at elevated measuring temperature respectively, from which the grain interior and grain boundary conductivities were calculated. The relationship between the conductivities of Sm2O3 doped CeO2 (SDC) electrolyte and measuring temperature obeys Arrhenius equation. The grain interior conductivity of SDC varies slightly with improving sintering temperature, while the total conductivity increases with enhancing sintering temperature. The effective index has a significant effect on the ionic conductivity of ceria doped based electrolyte. When the effective index improves, the ionic conductivity increases and the apparent conductance activation energy decreases.

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Synthesis and Electrical Conductivities of Sm2O3-CeO2 Systems

参考文献