钐掺杂对CeO_2电解质导电性能的影响  

Effect of Doped Samarium on Electrical Properties of CeO_2

作　　者：李世萍[1] 鲁继青[1] 罗孟飞[1] 

机构地区：[1]浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室,浙江金华321004

出　　处：《中国稀土学报》2009年第3期409-413,共5页Journal of the Chinese Society of Rare Earths

基　　金：浙江省自然科学基金资助项目(Z404383)

摘　　要：采用溶胶-凝胶法合成Ce1-xSmxO2-δ(x=0,0.1,0.2)系列固体电解质。通过XRD,Raman,SEM和交流阻抗技术系统研究掺杂浓度、相对密度、晶粒大小和氧空位浓度对电解质导电性能的影响。XRD结果表明,所有样品均呈现CeO2结构,即形成了Ce1-xSmxO2-δ固溶体。在掺杂离子相同,电解质的晶粒大小和相对密度十分接近的情况下,较多Sm3+的掺入能促使样品形成较多的氧空位,更有利于O2-的传递,从而使得Ce0.8Sm0.2O2-δ的电导性能高于Ce0.9Sm0.1O2-δ样品。A series of Ce1-xSmxO2-δ（x =0, 0.1 and 0.2） solid electrolytes were prepared by a citrate solgel method. The influence of content, density, grain size and concentration of oxygen vacancies on their electrical properties were investigated by X-ray diffraction （XRD）, Raman spectroscopy, SEM and AC impedance spectroscopy. The XRD results confirmed the formation of Ce1-xSmxO2-δ solid solution with uniform particle sizes, which could be sintered at 1500 ℃.The Raman spectroscopic results showed that a higher substitution of Sm into the ceria lattice could enhance the formation of oxygen vacancies. Under the same adulterant, grain size and density, the improvement of oxygen vacancies was beneficial to the migration of O^2- , which resulted in a higher electrical conductivity obtained on the Ce0.8 Sm0.2 O2-δ compared to that of the Ce0.9 Sm0. 1O2-δ

关 键 词：固体电解质 浓度 氧空位 电导率 稀土 

分 类 号：O614[理学—无机化学]