铈锆氧化物固溶体前驱物热分解动力学的研究  

Investigation of Dynamics of Thermal Decomposition of Precursor of Ce_(0.75)Zr_(0.25)O_2

作　　者：郑育英[1] 黄慧民[1] 李军[1] 王俏运[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《稀有金属》2008年第4期485-488,共4页Chinese Journal of Rare Metals

基　　金：广东省自然科学基金团队项目(04205301);广东省重大工业攻关项目(2004A10701005)资助

摘　　要：采用固相法制备了纳米级铈锆氧化物固溶体,对铈锆氧化物固溶体前驱物热分解动力学进行了研究。利用热重、差热分析等方法推测了前驱物的热分解机制。用Kissinger法计算前驱体的热分解活化能,Ea=137.80 kJ.mol-1。通过Coats-Redfern法,采用不同的固相动力学反应机制研究前驱体的热分解动力学,确定其机制函数为:G(a)=[-ln(1-a)]1/2,判断前驱体热分解反应为随机成核-随后生长机制。The solid solution of nanomeuer cerium-zirmethod. Dynamics of thermal decomposition of ceritan-zirconium oxide solid solution as a precursor was investigated by means of TG-DTA. Using Kissinger method, the activation energy of the thermal decomposition reaction; was calculated to be 137. 80 kJ· mol^-1. Using Coats-Redfem method and considered different kinetic modes of the thermal decomposition reaction a thermal decomposition kinetic equation was ascertained as follows, integral equation： G （ a ） = [ -ln（1 - a）]^1/2, differential equation： f（a） =2 （1- a）[-ln（1- a）]^1/2. And the thermal decomposition reaction of cerium-zirconium oxide solid solution was followed the mechanism of random nucleation and subsequent growth

关 键 词：固相反应 热分解 动力学 活化能 

分 类 号：O614.3[理学—无机化学]