【摘要】 采用EDTA-柠檬酸盐法合成Bi₂V_0.9Co_0.1O_5.5-δ超细粉体,采用TG-DSC、XRD、SEM等测试方法对粉体的合成过程、晶体结构和颗粒形态进行了表征。研究结果表明,经450℃热处理可以得到具有单一Aurivillus结构的超细粉体（约为200nm）。在620℃下烧结3h可制备出致密的陶瓷样品,陶瓷样品的平均晶粒粒径约为3μm,相对密度达到94.5%。采用交流阻抗谱法研究了Bi₂V_0.9Co_0.1O_5.5-δ陶瓷的氧离子导电性能,发现在600℃时Bi₂V_0.9Co_0.1O_5.5-δ陶瓷的氧离子电导率达1.0×10-1S·cm-1。更多还原

【Abstract】 Bi₂V_0.9Co_0.1O_5.5-δ powder was synthesized by an EDTA-citrate process. The crystal structure and morphology of synthesized powder were characterized by TG-DSC, XRD and SEM. The results indicate that fine and uniform powder （about 200nm） with a pure Aurivillius structure was produced by calcining at 450℃ for 1h. The ceramic specimen sintered at 620℃ for 3h shows a dense microstructure with an average grain size of about 3 μm and a relative density of 94.5%. The oxygen ionic conducting properties of the ceramic specimen were investigated by AC impedance spectroscopy. The specimen exhibits an oxygen ionic conductivity of 1.0×10 -1 S·cm -1 at a measuring temperature of 600℃.更多还原