纳米晶Y_2O_3∶Eu^(3+)的合成及其热分析动力学  

Synthesis of Nanocrystals Y_2O_3:Eu^(3+) and Thermal Analysis Kinetics of the Precursor

作　　者：司伟[1] 高宏[1] 王晶[1] 姜妲[2] 翟玉春[3] 

机构地区：[1]大连交通大学材料科学与工程学院辽宁省无机超细粉体制备及应用重点实验室,大连116028 [2]沈阳航空工业学院,沈阳110136 [3]东北大学材料与冶金学院,沈阳110004

出　　处：《无机化学学报》2010年第8期1443-1449,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50974026)资助项目

摘　　要：以Y(NO3)3、Eu2O3、CO(NH2)2为原料,使用超声波作用下的均匀沉淀法合成了纳米晶荧光粉Y2O3∶Eu3+。利用不同升温速率的热重及差热分析研究了纳米晶Y2O3∶Eu3+的合成动力学及晶粒生长动力学。研究表明,纳米晶Y2O3∶Eu3+的前驱体分解过程可分为3个步骤,利用Doyle-Ozawa法和Kissinger法分别计算了各个反应阶段的表观活化能,用Kissinger法确定每个反应阶段的反应级数和频率因子,并给出了各个阶段的动力学方程。根据晶粒生长动力学理论计算纳米荧光粉Y2O3∶Eu3+晶粒生长活化能为17.80kJ·mol-1,表明热处理过程中纳米晶粒的长大为扩散生长机制。The nanocrystal phosphor Y2O3∶Eu^3＋ was synthesized using Y（NO3）3,Eu2O3 and urea as raw materials,ultrasonic and homogeneous precipitation method. The synthesis and growth kinetics of the Y2O3 ∶Eu3 ＋ was investigated using TG-DTA at different heating rates in argon gas. The results show that the precursor of Y2O3∶Eu^3＋ decomposes in three well-defined steps. The apparent activation energy of each stage was calculated using the Doyle-Ozawa and Kissinger methods,the coefficients of reaction order,frequency factor and kinetic equations were also determined. The activation energy for the nanocrystallite growth is calculated to be 17.80 kJ·mol -1 according to kinetics theory of nanocrystallite growth. It can be inferred that the crystallite grows primarily by means of an interfacial reaction during the thermal treatment.

关 键 词：Y2O3∶Eu3+ 均匀沉淀法 纳米粉体 动力学 

分 类 号：O614.322[理学—无机化学] O614.338[理学—化学]