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本文通过高温固相法制备BaCeO_3-CeO_2复合电解质。采用XRD、SEM和交流阻抗技术分析材料的物相、结构和电学性能。结果表明:BaCeO_3-CeO_2复合电解质由钙钛矿型Ba Ce O3和少量立方相Ce O2构成。随着Ce O2含量的增加,Ba Ce O3的晶粒变小,Ce O2颗粒主要出现在晶界处。BaCeO_3-CeO_2复合电解质的总电导率遵守Arrhenius法则,随着温度从773 K到1073 K的逐渐升高而逐渐增加。当Ce O2的含量达到20%时,BaCeO_3-CeO_2复合电解质获得最大电导率。伴随着Ce O2含量在晶界处的增加,BaCeO_3-CeO_2复合电解质的电导率在4%H_2O-H2和空气中的电导率都明显提高。
In this paper, BaCeO_3-CeO_2 composite electrolytes were prepared by solid state reaction at high temperature. The phase, structure and electrical properties of the material were analyzed by XRD, SEM and AC impedance techniques. The results show that the BaCeO_3-CeO_2 composite electrolyte consists of perovskite Ba Ce O 3 and a small amount of cubic phase Ce O 2. With the increase of Ce O2 content, the grains of Ba Ce O3 become smaller and the Ce O2 particles mainly appear at the grain boundaries. The total conductivity of the BaCeO_3-CeO_2 composite electrolyte obeys the Arrhenius law and gradually increases with the temperature increasing from 773 K to 1073 K. When the content of Ce O2 reaches 20%, the maximum conductivity of BaCeO_3-CeO_2 composite electrolyte is obtained. With the increase of Ce O2 content at the grain boundary, the conductivity of BaCeO3-CeO2 composite electrolyte in 4% H2O2-H2 and air are significantly increased.