La_2O_3纳米晶的制备与表征  

Preparation and Characterization of La_2O_3 Nanocrystals

作　　者：张梅[1] 杨绪杰[1] 陆路德[1] 汪信[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《宇航材料工艺》1999年第5期38-40,共3页Aerospace Materials & Technology

摘　　要：用聚乙二醇法制备了Ｌａ２Ｏ３ 纳米晶，用Ｘ 射线粉末衍射（ＸＲＤ） ，透射电子显微镜（ＴＥＭ） 及ＢＥＴ比表面吸附对Ｌａ２Ｏ３ 纳米晶的粒径和形貌进行了表征。其粒径随热处理温度的上升而增大，形貌由球形变为片状。粒径分布窄，无硬团聚现象产生。在６００ ℃热处理得到单斜与六方晶系的混合Ｌａ２Ｏ３ 纳米晶，随着热处理温度的升高，六方晶系所占的比例上升，８５０ ℃以上热处理时，得到纯的六方晶系。拉曼光谱测试的结果验证了晶体结构的变化。La 2O 3 Nanocrystals were prepared by polyethylene glycol method. The structure and morphology of La 2O 3 nanocrystals were characterized by X-ray powder diffraction (XRD), transmission electron microscope (TEM) and BET specific surface area absorption meter.La 2O 3 nanocrystals with different size of particles and different type of morphology were produced at different heat treatment temperatures. Mixed La 2O 3 nanocrystals of monocline and hexagonal were obtained at 600℃ and completely transformed to the hexagonal phase when the heat treatment temperature raised above 850℃. The Raman spectra of the La 2O 3 nanocrystals are also analyzed in this paper.

关 键 词：氧化镧 纳米晶 聚乙二醇法 制备 

分 类 号：O614.331[理学—无机化学]