Ce_(1-x)Nd_xO_(2-δ)固溶体的电子顺磁共振谱和阻抗谱的研究  

Study of Electron Paramagnetic Resonance Spectra and Impedance Spectra for the Solid Solutions Ce_(1-x)Nd_xO_(2-δ)

作　　者：林晓敏[1] 李莉萍[2] 苏文辉[3] 

机构地区：[1]北华大学理学院物理系,吉林132013 [2]吉林大学物理学院,长春130023 [3]哈尔滨工业大学理学院

出　　处：《化学学报》2007年第10期989-993,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(No.10374022);吉林省教育厅及北华大学科研基金资助项目.

摘　　要：利用溶胶-凝胶方法在800℃焙烧10h后,合成了固溶体Ce1-xNdxO2-δ(x=0.05～0.55),X射线衍射(XRD)测试表明固溶体已经形成立方萤石结构;电子顺磁共振谱(EPR)研究表明在固溶体Ce1-xNdxO2-δ中随着掺杂量x的增大,Ce3+离子含量减少,说明掺杂Nd3+离子可以抑制Ce4+的还原;交流阻抗谱的测量表明固溶体Ce0.9Nd0.1O2-δ具有离子导电特性,600和700℃时的电导率分别为4.25×10-3和1.12×10-2S?cm-1,活化能为0.68eV.Solid solutions Ce1-xNdxO2-δ （x=0.05-0.55） were prepared by sintering the gel at 800 ℃ for 10 h by sol-gel method. XRD showed that solid solutions Cel-xNdxO2-δ were crystallized in a cubic fluorite structure. The electron paramagnetic resonance spectra suggested that the content of Ce^3＋ ions is decreased with the increasing dopant content x in the solid solutions Ce1-xNdxO2-δ, which suggested that doping with lower valence Nd^3＋ ions may control the redox of Ce^4＋ ions in the solid solutions. The impedance spectra of the solid solutions showed ionic conduction. The conductivities of Ce0.9Ndo.1O2-δ were 4.25 × 10^-3 and 1.12 × 10^-2 S.cm^-1 at 600 and 700 ℃ respectively, and activation energy was 0.82 eV.

关 键 词：溶胶-凝胶方法 固溶体Ce1-xNdxO2-δ EPR谱 电导率 

分 类 号：O614.332[理学—无机化学]