Al_2O_3掺杂对CeO_2基固体电解质性能的影响  

Effects of Doping Al_2O_3 on Properties of CeO_2-Based Electrolyte Material

作　　者：梁广川[1] 梁秀红[1] 

机构地区：[1]河北工业大学材料学院,天津300130

出　　处：《中国稀土学报》2002年第z2期122-125,共4页Journal of the Chinese Society of Rare Earths

基　　金：河北省自然科学基金资助项目(500020)

摘　　要：利用四探针电阻测量法、SEM等手段研究了CeO2基固体电解质材料中掺杂Al2O3后的性能变化。实验发现,加入的Al2O3分布在晶界处,将会导致裂纹偏转,可以显著增加CeO2基材料的强度,最大弯曲强度对应的Al2O3添加剂量为3mol%。另外,掺杂Al2O3后由于热膨胀系数的差异,在CeO2中引入压缩性应力,可以抑制裂纹的进一步扩展。加入Al2O3还具有显著的促进烧结作用,但使电导率降低。The effects of doping Al2O3 on the properties of the CeO2based electrolyte materials were investigated by the means of fourprobe method, SEM etc. It is found that doping Al2O3 in CeO2based electrolyte materials can increase the mechanical strength, and the doping concentration of Al2O3 corresponding to the maximum strength is 3mol%. The reason is that doping Al2O3 can bring on compressive stress and prevent the microcrack from propagation. On the other hand, Al2O3 distributes in the grain boundary and causes the crack deflection. Doping Al2O3 improves sintering ability and decreases the electrical conductivity as well.

关 键 词：稀土 CEO2 固体电解质  AL2O3 强度 

分 类 号：O146.4+5[理学—数学]