摘要
在燃烧法制得的磷灰石型LSO电解质纳米粉体基础上,研究了预处理、成型压力、烧结温度和保温时间对LSO烧结体致密度的影响.烧结实验结果表明:球磨预处理和合适的成型压力,可以有效消除颗粒间的团聚、降低烧结温度和提高致密度;最佳成型压力为225 MPa;最佳烧结温度为1 400℃下保温3 h,烧结体的致密度高达96%.运用交流阻抗谱法研究了LSO烧结体的电性能,结果表明:烧结体随温度的升高,晶界电阻逐渐减小,晶粒电阻逐渐占据主导;烧结体电导率与温度的关系符合Arrhenius经验公式,700℃时离子电导率达到4.38×10-3s/cm.
On the basic of use combustion to prepare the LSO,batch experiment revealed the density of LSO sintered body was influenced by the pretreatment, forming pressure, sintering temperature and holding temperature. The results showed that attrition pretreatment and fitting forming pressure could eliminate inter-agglomerate, lower sinter point and improve density of the sample efficiently. The fitting forming pressure is 225 MPa. The best sintering temperature is 1 400 ℃ for 3 hours. Electrochemical impedance spectroscopy （EIS） was utilized to study the electrical property of the sinter body. The results demonstrated that along with the test temperature rose, grain boundary resistance decreased and grain resistance increased. The relationship between sample＇s conductivity and temperature was in accord with empirical formula of Arrhenius. The sintered body shows high ionic conductivity （4.38×10^-3s/cm at 700℃）.
出处
《武汉工程大学学报》
CAS
2011年第1期48-53,共6页
Journal of Wuhan Institute of Technology
基金
湖北省教育厅重大项目(z20091501)
国家自然科学基金项目(50874081)
关键词
燃烧合成
硅酸镧
固体电解质
烧结
离子电导率
combustion
lanthanum silicate
solid electrolyte
sintering
ionic conductivity
