固体电解质Ce_(0.9)Er_(0.1-x)Pr_xO_(1.95+δ)的微观结构及电性能  

Microstructure and Electrical Properties of Solid Electrolytes Ce_(0.9)Er_(0.1-x)Pr_xO_(1.95+δ)

作　　者：林晓敏[1] 朱丽丽[1] 韩健[1] 刘晓梅[2] 

机构地区：[1]北华大学物理学院,吉林132013 [2]吉林大学物理学院,长春130021

出　　处：《高等学校化学学报》2015年第1期61-66,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51272087);吉林省教育厅科学技术研究项目(批准号:2014181)资助~~

摘　　要：采用柠檬酸溶胶-凝胶法制备了固体电解质Ce0.9Er0.1-xPrxO1.95＋δ（x=0.02-0.08）,利用X射线粉末衍射（XRD）、原子力显微镜（AFM）、拉曼光谱（Raman）、X射线光电子能谱（XPS）和交流阻抗谱研究了样品的微观结构和电性能.XRD结果表明,800℃煅烧的所有样品均形成了单相立方萤石结构;Raman光谱结果表明,Ce0.9Er0.05Pr0.05O1.95＋δ具有氧缺位的立方萤石结构;XPS分析表明,Ce0.9Er0.05Pr0.05O1.95＋δ存在氧缺位,Pr3＋离子和Pr4＋离子共存;AFM观测结果表明,1300℃下烧结的样品比1400℃下烧结的样品致密;交流阻抗谱结果表明,Pr掺杂量x=0.05时,Ce0.9Er0.05Pr0.05O1.95＋δ的电导率最高（σ600℃=1.34×10-2S/cm,Ea=0.90 e V）,比未掺杂Pr的Ce0.9Er0.1O1.95（σ600℃=8.81×10-3S/cm,Ea=0.92 e V）提高了52%,说明在Ce0.9Er0.1O1.95中适量掺杂Pr可提高材料的电导率,降低活化能.The microstructure and electrical conductivity of Ce0.9Er0.1-xPrxO1.95＋δ（x=0—0. 08） solid electro- lytes synthesized by citric sol-gel method were characterized by means of X-ray diffraction （ XRD ） , atomic force microscopy（ AFM） , Raman, X-ray photoelectron spectroscopy and impedance spectroscopy. XRD meas- urements show that all the samples calcined at 800 ℃ crystallize in single cubic fluorite structure. The Raman spectra indicate that the Ce0. 9 Er0. 05 Pr0. 05 O1. 95＋δis cubic fluorite structure with oxygen vacancies. X-ray photoe- lectron spectroscopy analysis suggest that oxygen vacancies and the mixed valence Pr3＋ and Pr4＋ ions exist in Ce0. 9 Er0. 05 Pr0. 05 O1. 95＋δ. AFM results show that sample Ce0. 9 Er0. 05 Pr0. 05 O1. 95＋δsintered at 1300℃ is denser than that sintered at 1400 ℃. The maximum conductivity of Ce0. 9 Er0. 05 Pr0. 05 O1. 95＋δ is found at x=0. 05 （σ600 ℃=1. 34 ×10-2 S/cm, Ea=0. 90 eV） . The conductivity of Ce0. 9 Er0. 05 Pr0. 05 O1. 95＋δincreases by 52% in comparison with that of Ce0.9Er0.1O1.95 without Pr（σ600 ℃ =8. 81×10-3 S/cm, Ea=0. 92 eV）, which suggests that co- doping with appropriate ratio of Pr can further improve the electrical performance of Ce0. 9 Er0. 1 O1. 95 .

关 键 词：固体电解质 铒和镨双掺杂氧化铈 拉曼光谱 X射线光电子能谱 电导率 

分 类 号：O614.33[理学—无机化学] O646[理学—化学]