改进溶胶-凝胶法制备超细纳米Ce_(0.8)Nd_(0.2)O_(2-δ)复合氧化物的研究  

An Improved Method for Preparation of Ce_(0.8)Nd_(0.2)O_(2-δ) Composite Oxides with Ultrafine Nanoparticles

作　　者：方萍[1] 鲁越青[1] 

机构地区：[1]绍兴文理学院化学化工学院,浙江绍兴312000

出　　处：《安徽师范大学学报（自然科学版）》2015年第4期347-350,共4页Journal of Anhui Normal University(Natural Science)

基　　金：绍兴文理学院(2012)重点科研项目

摘　　要：采用常规和改进的柠檬酸溶胶-凝胶法(Sol-Gel)制备了Ce0.8Nd0.2O2-δ复合氧化物,通过XRD、TG-DSC和Raman对复合氧化物的结构进行表征.结果表明,改进的柠檬酸Sol-Gel法可制得晶粒更小的纳米Ce0.8Nd0.2O2-δ复合氧化物,N-800样品的平均晶粒仅为15.8nm,说明改进的方法有利于提高样品的抗烧结能力.两种Ce0.8Nd0.2O2-δ复合氧化物中均出现了归属于由氧缺位的不对称振动产生的位于550cm-1附近的Raman谱峰,表明固溶体的生成有利于促进氧缺位的形成.Two types of Ce0. 8Nd0. 2O2- δcomposite oxides were prepared by conventional and improved citrate SolGel methods with different thermal treatment conditions. The structures of the solid solutions were characterized by XRD,TG-DSC and Raman spectroscopy. Experiment results show that the composite oxides prepared by improved citrate Sol-Gel method have smaller crystallite sizes than the samples prepared by conventional method. The crystallite size of N-800 is only 15. 8nm,which indicates the improved method can increase the thermal stability.The broad Raman vibration bands around 550cm- 1are attributed to lattice defects resulting in oxygen vacancies.This indicates that the Ce0. 8Nd0. 2O2- δsolid solutions can promote the formation of oxygen vacancies.

关 键 词：Ce0.8Nd0.2O2-δ复合氧化物 柠檬酸溶胶-凝胶法 XRD RAMAN 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O611.4[理学—无机化学]