低温燃烧合成Ce_(0.8)Nd_(0.2)O_(1.9)固溶体纳米粉末  

Synthesis of Nanocrystalline Ce_(0.8)Nd_(0.2)O_(1.9) Powders by Low Temperature Combustion Process

作　　者：高勇[1] 王玲玲[1] 刘晃清[1] 

机构地区：[1]湖南大学,湖南长沙410082

出　　处：《稀有金属材料与工程》2005年第9期1505-1508,共4页Rare Metal Materials and Engineering

摘　　要：采用低温燃烧合成工艺在甘氨酸-硝酸盐体系中制备出Ce0.8Nd0.2O1.9固溶体纳米粉末,重点考察了甘氨酸与硝酸盐的配比(G/N)以及焙烧温度对粉末特性的影响。通过热重-差示扫描量热分析(TG-DSC)得知,燃烧反应的点火温度为257℃。利用X射线衍射(XRD)、透射电镜(TEM)、比表面积仪(BET)及傅里叶红外光谱(FTIR)等手段对粉末的结构、形貌、成分、尺寸及比表面积进行了分析。结果表明:燃烧反应后直接得到萤石型结构的单相固溶体,晶粒尺寸为8nm^12nm之间,比表面积为38m2/g^47m2/g;晶粒尺寸随焙烧温度升高而增加,在800℃下焙烧1h后,可以去除反应残留物质,并使获得的晶形更加完整。In this work, synthesis of the nanocrystalline Ce0.8 Nd 0.2O1.9 solid solution powders by a nitrate-glycine gel-combustion process was investigated. Special attention was given to the influence of the glycine/nitric ratio （G/N） and calcination temperature on powders propertity. The temperature required to initiate the combustion obtained from the TG-DSC technique was about 257℃. The powders also be characterized by XRD, TEM, BET and FTIR to ascertain the crystalline structure, morphology, ingredient, crystalline size and specific surface area. It was showing that the single phase fluorite structure solid solution was directly formed after combustion reaction with the crystalline size of 8 nm-12 nm and the specific surface area of 38 m^2/g-47 m^2/g. Furthermore, the crystalline size was found increasing with the increase of calcination temperature. The impurity in powders was removed after calcined at 800℃ for 1 h, and the crystalline forms was observed perfect at the meantime.

关 键 词：低温燃烧合成 甘氨酸-硝酸盐 CEO2 纳米粉末 

分 类 号：TF124[冶金工程—粉末冶金]