BaCeO_3-CeO_2复合电解质的制备、结构和电学性能研究（英文）

Synthesis,Structure and Electrical Properties of BaCeO_3-CeO_2 Composites

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。

BaCeO3 -CeO2 composites were prepared by pressureless-sintering method. Phase structure and electri- ca] properties were investigated by X-ray diffraction, field-emission scanning electron microscopy and ac imped- ance spectroscopy. BaCeO3 -CeO2 composites consist of the perovskite-type BaCeO3 and small amounts of the cu- bic CeO2. With increasing the content of CeO2, the grain size of the BaCeO3 decreases, and the CeO2 particles mainly occur at the grain boundaries. Total conductivities of BaCeO3 -CeO2 composites obey the Arrhenius rela- tion, and gradually increase with increasing temperature from 773 to 1073 K. The highest electrical conductivity of BaCeO3 -CeO2 composites is obtained that the content of the second phase CeO2 is 20%. With increasing the CeO2 content at the grain boundaries, electrical conductivities of BaCeO3 -CeO2 composites increase remarkably both in 4% H2O-snturated 14. and in air.