固溶体Ce0.8Pr0．2O2-δ的合成及性质研究  

Synthesis and Properties of Solid Solution Ce_(0.8)Pr_(0.2)O_(2-δ)

作　　者：林晓敏[1] 朱丽丽[1] 李莉萍[2] 苏文辉[3] 

机构地区：[1]北华大学物理学院,吉林吉林132013 [2]吉林大学物理学院,吉林长春130023 [3]哈尔滨工业大学凝聚态科学与技术中心

出　　处：《中国稀土学报》2008年第2期162-166,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(10374022);吉林省教育厅科研计划项目(200690)资助

摘　　要：利用溶胶-凝胶方法合成了Ce0.8Pr0．2O2-δ固溶体，XRD结果表明，经200℃焙烧就已经形成立方萤石结构固溶体，晶粒尺寸为8．1nm，随焙烧温度的升高，晶粒尺寸增大。X射线光电子能谱（XPS）结果表明，样品中存在氧离子缺位，铈离子主要为Ce^4＋离子，镨离子以混合价态Pr^3＋和Pr^4＋存在。固溶体Ce0.8Pr0．2O2-δ的拉曼谱（Rarnan）观察到4个峰，458和1140cm^-1峰为特征F2g振动谱带，较宽的570和187cm^-1峰对应氧离子缺位及引起的不对称振动。交流阻抗谱表明固溶体Ce0.8Pr0．2O2-δ在600℃时的电导率为1．44×10^-3S·cm^-1，活化能为Ea=0．67eV（650～800℃），Ea=0．91eV（400～600℃）。The solid solution Ce0.8Pr0.2O2-δ was synthesized by sol-gel method. XRD measurement showed that solid solution Ce0.8Pr0.2O2-δ crystallized in cubic fluorite structure at 200 ℃. The grain size of the solution was 8.1 nm. The average grain size increased with temperature. XPS analysis suggested that oxygen vacancy, mixed valence Pr^3＋/Pr^4＋ ions and major Ce^4＋ ions existed in the solid solutions. The Raman spectra of the solid solution Ce0.8Pr0.2O2-δ exhibitedfour peaks. The 458 and 1140 cm^-1 peaks were attributed to Raman active F2g mode assigned to symmetric breathing mode of oxygen atoms around cerium ions. The peaks at 570 and 187 cm^-1 were attributed to the asymmetric vibration caused by oxygen vacancies. Impedance spectra showed that the conductivity for Ce0.8Pr0.2O2-δ was 1.44×10^-3 S·cm^-1 at 600 ℃, and the activation energy was Ea = 0.67 eV （650 - 800 ℃ ）, Ea = 0.91 eV（400 - 600 ℃）.

关 键 词：Ce0.8Pr0.2O2-δ 溶胶-凝胶方法 XPS RAMAN 阻抗谱 稀土 

分 类 号：O641.33[理学—物理化学]