采用改性共沉淀法合成了La9.33Si6O26-10wt% Zr0.86Y0.14O1.92两相共存的氧离子导电复合材料, 利用X射线衍射、扫描电子显微镜、交流阻抗技术分别表征了材料的相组成、微观组织和离子导电性. 结果表明, 复合材料粉体平均晶粒尺寸为35 nm, 烧结块体的平均颗粒尺寸为500 nm; 在300~700℃温度范围内, 复合材料的导电率均高于La9.33Si6O26或Zr0.86Y0.14O1.92单相材料, 且700℃时比La9.33Si6O26高出1个数量级. 结合交流阻抗谱及电模量谱对复合材料的导电机理进行了分析讨论.
The oxygen-ionic conductor of La9.33Si6O26-10wt% Zr0.86Y0.14O1.92 composite material was prepared by using a modified co-precipitation method. X-ray diffraction, scanning electron microscope and complex impedance were adopted to investigate the phase component, microstructures and conductivities of the composite material, respectively. The results show that the average grain size of the as-calcined powder is 35 nm and the average particle size of the as-sintered composite ceramic is about 500 nm. The conductivities of the composite ceramic are higher than those of the single phase La9.33Si6O26 and Zr0.86Y0.14O1.92 ceramic at the temperatures from 300℃ to 700℃. The conductivity of the composite ceramic is one order in magnitude higher than that of polycrystalline La9.33Si6O26 at 700℃. The conduction mechanism of the composite material is discussed by the analysis of impedance spectra and electric modulus spectra.
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