CdO纳米晶的固相合成及晶化动力学研究  

Synthesis of Cadmium Oxide (CdO) Nanocrystallite and Crystallization Kinetics during Thermal Treatment

作　　者：杨华明[1] 张科[1] 史蓉蓉[1] 李云龙[2] 张向超[1] 

机构地区：[1]中南大学资源生物学院无机材料系,湖南长沙410083 [2]长沙大学,湖南长沙410003

出　　处：《材料科学与工程学报》2005年第4期503-506,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50304014;50474046);湖南省科技攻关计划资助项目(03GKY3038);长沙大学科学技术研究基金资助项目(SF030302)

摘　　要：以CdCl2和Na2CO3为原料,NaCl为稀释剂,利用固相反应合成前驱体,再经焙烧合成CdO纳米晶。用X-射线衍射(XRD)分析了不同焙烧温度对合成CdO晶粒尺寸的影响。研究结果表明:按Scherrer公式计算合成CdO纳米晶的晶粒尺寸在30～44nm,焙烧温度越高,晶粒尺寸越大;根据前驱体不同升温速率下的差热(DTA)曲线,用Kissinger和Ozawa法计算合成CdO纳米晶的活化能分别为164.7kJ mol和175.6kJ mol,差别不大;根据晶粒生长动力学理论计算CdO晶粒长大的活化能为12.2kJ mol,表明热处理过程CdO纳米晶粒的长大主要以界面扩散为主。Nanocryestalline cadmium oxide （CdO） was successfully synthesized by heating the precursor, which was obtained by solid-state reaction of CdCl2 and Na2CO3 with NaCl as a diluent. Differential thermal analysis （DTA） was employed to investigate the crystallization kinetics of CdO nanoparticles. Variation of the CdO nanoparticle size with calcination temperature was investigated using X-ray diffractometry （XRD）. The mechanism for the nanocrystallite growth was primarily discussed. The results indicate that the synthesized CdO possesses a nanocrystalline structure with crystal size of 30 - 44nm, varying with the calcination temperature. The apparent activation energies of CdO nanocrystallite formation after calcination of the precursor were analyzed using Kissinger and Ozawa methods, the calculated values were 164.7kJ/mol and 175.6kJ/mol, respectively. The activation energy for the nanocrystallite growth was calculated to be 12.2 kJ/mol according to kinetics theory of nanocrystallite growth, indicating that CdO nanocrystallite grows primarily by means of an interfacial reaction during the calcination.

关 键 词：氧化镉(CdO) 纳米晶 固相合成 动力学 活化能 

分 类 号：TM27[一般工业技术—材料科学与工程]