Ce_(0.8)Pr_(0.2-x)Nd_xO_(2-δ)(x=0.02,0.05,0.1)固溶体的合成与性质研究  

Preparation and Properties for Solid Solution Ce_(0.8)Pr_(0.2-x)Nd_xO_(2-δ)(x=0.02,0.05,0.1)

作　　者：朱丽丽[1] 林晓敏[1] 陈剑锋[1] 

机构地区：[1]北华大学,吉林吉林132013

出　　处：《大学物理实验》2017年第3期1-4,42,共5页Physical Experiment of College

基　　金：吉林省教育厅"十二五"科学技术研究项目(2014181)

摘　　要：采用溶胶-凝胶法制备了双稀土掺杂氧化铈Ce_(0.8)Pr_(0.2-x)Nd_xO_(2-δ)(x=0.02,0.05,0.1)固溶体。X射线衍射分析阐明,经800℃烧结的全部固溶体都形成了单相立方萤石结构,平均晶粒尺寸在20~25 nm之间。拉曼光谱结果阐明,固溶体Ce_(0.8)Pr_(0.2-x)Nd_xO_(2-δ)是具有氧空位的立方萤石结构,适量的掺杂Nd有利于Ce_(0.8)Pr_(0.2-x)Nd_xO_(2-δ)氧空位浓度的增加。阻抗谱结果阐明,稀土双掺杂的Ce_(0.8)Pr_(0.2-x)Nd_xO_(2-δ)比稀土单掺杂的Ce_(0.83)Sm_(0.17)O_(2-y)的电导率高,Ce_(0.8)Pr_(0.18)Nd_(0.02)O_(2-δ)的电导率最大,600℃时电导率为1.85×10^(-2)S/cm。Ce0.8 Pr0.2-x Ndx O2-δ （ x= 0.02,0.05,0.1 ） solid solutions were synthesized by the sol-gel method. The XRD results show that all powders calcined at 800 ℃ are crystallized in a single cubic fluorite structure.The average grain sizes are between 20 nm and 25 nm.The Raman spectra analysis reveals that the solid solution Ce0.8 Pr0.2-x Ndx O2-δhas a cubic fluorite structure with oxygen vacancies.A small amount of doping Nd help Ce0.8 Pr0.2-x Ndx O2-δoxygen vacancy concentration increased. Impedance spectra shows that the conductivity of rare earth co-doped ceria Ce0.8 Pr0.2-x Ndx O2-δis higher than that of single rare earth doped eeria Ce0.83Sm0.17O2-y. The results also show that Ce0.8 Pr0.2-x Ndx O2-δ possess maximum conductivity. At 600 ℃, the conductivity is 1.85× 10^-2S/cm.

关 键 词：氧化铈 氧缺位 拉曼光谱 阻抗谱 

分 类 号：O4-34[理学—物理]