固溶体Ce0.8Pr0.2O2-δ的合成及性质研究

中国稀土学报, 2008, 26(2): 162-166.

固溶体Ce0.8Pr0.2O2-δ的合成及性质研究

林晓敏 ^1, , 朱丽丽 ^2, , 李莉萍 ^3, , 苏文辉 ^4,

1.北华大学物理学院,吉林,吉林,132013;吉林大学物理学院,吉林,长春130023

2.北华大学物理学院,吉林,吉林,132013

3.吉林大学物理学院,吉林,长春130023

4.哈尔滨工业大学凝聚态科学与技术中心,黑龙江,哈尔滨,150001;中国科学院国际材料物理中心,辽宁,沈阳,110015

基金项目: 吉林省教育厅科研项目(200690) 国家自然科学基金(10374022)

关键词： Ce0.8Pr0.2O2-δ , 溶胶-凝胶方法 , XPS , Raman , 阻抗谱 , 稀土

Synthesis and Properties of Solid Solution Ce0.8Pr0.2O2-δ

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8.1 nm, 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Ce4+离子,镨离子以混合价态Pr3+和Pr4+存在. 固溶体Ce0.8Pr0.2O2-δ的拉曼谱(Raman)观察到4个峰,458和1140 cm-1峰为特征F2g振动谱带,较宽的570和187 cm-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1.44×10-3 S·cm-1, 活化能为Ea=0.67 eV (650～800 ℃), Ea=0.91 eV (400～600 ℃).

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