过渡金属氧化物掺杂Ce_(0.8)Nd_(0.2)O_(1.9)固体电解质的结构和电性能  

Structure and electrical properties of Transitional Metal Oxides(TMOs)-doped Ce_(0.8)Nd_(0.2)O_(1.9) based solid electrolytes

作　　者：周德凤[1] 刘建伟[1] 杨国程[1] 李朝辉[1] 罗飞[1] 

机构地区：[1]长春工业大学化学与生命科学学院,吉林长春130012

出　　处：《长春工业大学学报》2012年第5期588-593,共6页Journal of Changchun University of Technology

基　　金：国家自然科学基金资助项目(20871023);吉林省科技发展计划基金资助项目(20101549)

摘　　要：采用溶胶凝胶法合成Ce0.8Nd0.2O1.9(NDC)粉体,分别将1%(x,摩尔分数)的过渡金属氧化物(Transitional Metal Oxides,TMOs)MnO2,FeO1.5或CoO添加到NDC粉体中,经10MPa压片后于1 300℃烧结6h。用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)对样品进行结构表征,采用交流阻抗谱(AC)测试样品导电性能。结果表明,MnO2,Fe2O3或CoO对NDC均可有效促进样品的致密化,增加相对致密度和提高NDC的晶粒电导率;1%(x)MnO2或1%(x)CoO的掺杂对NDC的晶界电导率产生有害的影响,掺杂1%(x)FeO1.5对NDC晶界杂质SiO2有一定的清除作用,提高晶界电导率。Fe2O3不仅是一种良好的烧结助剂,而且是一种有效的晶界清除剂。The precursor powder of Ce0.8Nd0.2Ol.9 （NDC） was prepared by the sol-gel method and 1 % （molar fraction, x） Transitional Metal Oxides （TMOs） MnO2, FeO1.5 or CoO were added to the NDC powder, respectively. After pressed under 10 MPa, the samples were sintered at 1 300℃ for 6 h. The characterizations focused on phase structure, electrical conductivity of all the samples were inves- tigated by X-ray diffraction （XRD）, field emission scanning electron microscopy （FE-SEM）. Electrical conductivity of the pellets was measured using AC impedance spectroscopy. The results showed that the MnO2, Fe2O3 or CoO could be more effective in promoting densification, increase relative density, increase the grain interior conductivity of the NDC. 1% （x） MnO2 or 1% （x） CoO additions have found to be detrimental to the grain boundary conductivity of the NDC, however, addition of 1%（x）FeO1.5 has a scavenging effect on SiO2 impurity, increase the grain-boundary conductivity. Therefore, these investigations have indicated that Fe2Oa is shown to be an effective sintering aid, as well as a grain boundary scavenger.

关 键 词：固体电解质 氧化铈 过渡金属氧化物 电导率 

分 类 号：O649[理学—物理化学]