氧化镧粉体的制备及其对晶粒粒度的影响  

Preparation of La_2O_3 powder and effect on grain size

作　　者：李德贵[1] 张金磊[1] 覃铭[1] 邓玉萍[1] 

机构地区：[1]百色学院物理与电信工程系,广西百色533000

出　　处：《无机盐工业》2014年第11期21-23,61,共4页Inorganic Chemicals Industry

基　　金：广西自然科学基金资助项目(2011GXNSFA018034);百色学院一般科研项目基金资助项目(2011KB02)

摘　　要：以硝酸镧、聚乙二醇和柠檬酸为原料,采用溶胶-凝胶法制备了氧化镧粉体。研究了在制备过程中分散剂种类(聚乙二醇与柠檬酸)、焙烧温度、焙烧时间等因素对氧化镧粉体晶粒尺寸的影响及氧化镧的吸水性能。结果表明:以聚乙二醇为分散剂制备的氧化镧粉体晶粒粒度比柠檬酸为分散剂制备的样品晶粒粒度小;干凝胶在780℃下煅烧1 h,可以完全分解为氧化镧。焙烧温度越高,时间越长,晶粒尺寸就越大;氧化镧的吸水性很强,吸水后形成氢氧化镧。该研究可为控制粉体晶粒度提供参考。La2O3 powder was prepared by sol-gel method with lanthanum nitrate, polyethylene glycol, and citric acid as raw materials, and the influences of dispersant species （polyethylene glycol and citric acid）, calcination temperature, and calcina- tion time etc.on the grain size of La2O3 powder were investigated, and the performance of water absorption was also discussed. Results showed that the grain size of lanthanum oxide prepared with polyethylene glycol was less than that prepared with citric acid;dry gel can be completely decomposed into lanthanum oxide by calcined at 780 for 1 h;the higher calcination temperature and the longer calcination time, the larger grain size;lanthanum oxide will become La （OH）3 when it exposed to the air because of its strong water absorption.The study could be a reference for the controlling of powder grain size.

关 键 词：溶胶-凝胶法 氧化镧 晶粒度 聚乙二醇 柠檬酸 

分 类 号：TQ133.3[化学工程—无机化工]