Ce_(1-x)Eu_xO_(2-δ)(x=0.05～0.50)固溶体的溶胶-凝胶法合成与性质研究  

Preparation and Properties for Solid Solution Ce_(1-x) Eu_xO_(2-δ) (x=0.05～0.5) Prepared by Sol-gel Method

作　　者：林晓敏[1] 宋文福[1] 李莉萍[2] 苏文辉[2,3] 

机构地区：[1]北华大学物理系 [2]吉林大学物理学院 [3]中国科学院国际材料物理中心沈阳110015

出　　处：《化学学报》2004年第10期951-955,共5页Acta Chimica Sinica

基　　金：国家自然科学基金 (No.1 980 4 0 0 5);北华大学科研基金资助项目

摘　　要：利用溶胶 -凝胶方法合成了固溶体Ce1 -xEuxO2 -δ,通过XRD ,Raman ,XPS和交流阻抗谱系统研究了固溶体Ce1 -x EuxO2 -δ的结构 ,确定了稀土离子价态及掺杂对CeO2 基电解质电性能的影响 .XPS分析表明固溶体Ce1 -xEuxO2 -δ中 ,Eu离子价态为 +3价 ,Ce离子主要以Ce4+ 离子形式存在 ,阻抗谱测试表明低价离子掺杂使固溶体Ce1 -xEuxO2 -δ的导电率得到很大提高 ,导电率x =0 .2时达到最大值σ60 0℃ =2 .87× 10 -3 S·cm-1 .导电活化能为Ea=0 .72eV .In this paper, a systematic study of solid solutions Ce 1- x Eu x O 2- δ ( x =0.05～0.5) prepared at 800 ℃ by sol gel method is presented. The structure, valence characteristics and transport properties for these solid solutions are determined and discussed by XRD, XPS, Raman, and impedance spectra. XPS analysis suggested the presence of Eu 3+ and major Ce 4+ ions in the Ce 1- x Eu x O 2- δ solid solutions. The impedance spectra of the solid solutions showed that the conductivity was increased greatly by doping lower valence ions. Ce 0.8 Eu 0.2 O 2- δ solid solution possessed a maximum conductivity. At 600 ℃, the conductivity and activition energy were 2.87×10 -3 S·cm -1 and 0.72 eV, respectively.

关 键 词：溶胶-凝胶法 Ce1-xEuxO2-δ 交流阻抗谱系统 电导率 价态 稀土元素 尾气净化系统 污染治理 

分 类 号：O614[理学—无机化学]