Grain Growth Kinetics of SnO_2 Nanocrystals Synthesized by Precipitation Method

作     者：宋晓岚 SONG Xiaolan,LIU Dongfeng1,ZHANG Yimeng1,DING Yi1,LI Mei1,WANG Shunkui1,HE XI1,QU Yixin2 (1.School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;2.College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

作者机构：School of Minerals Processing and BioengineeringCentral South University 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2010年第25卷第6期

页      面：929-934页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Funded by the International Cooperation of Science and Technology Ministry PRC (2005DFBA028) the Nation Undergraduate Innovation Experimentation Plan of Education Ministry PRC (LA08025) 

主　　题：SnO2 nanocrystal precipitation method calcination grain growth kinetics 

摘      要：Monodispersed spheroidal SnO2 nanocrystals with the grain size of 8-30 nm were synthesized by the precipitation method using SnCl4·5H2O （stannic chloride hydrate） as raw *** scanning calorimetry/thermogravimetry （DSC/TG）,X-ray diffraction （XRD） and transmission electron microscope （TEM） were used to characterize the structure of SnO2 *** influences of the calcination temperature and time on the lattice constant,the lattice distortion and the grain size of SnO2 nanocrystals were discussed based on the XRD *** grain growth kinetics of SnO2 nanocrystals during calcination process was simulated with a conventional grain growth model which only took into account of diffusion and with a new isothermal model proposed by our group,which took into account of both diffusion and surface *** conventional model,the grain growth rate constant of SnO2 crystals is 1.55×104nm5/min with a pre-exponential factor of 5 and an activation energy of 108.62 kJ/*** with the convention model,the new isothermal model is more realistic in reflecting the grain growth behavior of SnO2 nanocrystals during the calcination *** indicates that the grain growth of SnO2 nanocrystals is controlled by both diffusion and reaction factors,and the effect of surface reactivity on the grain growth of SnO2 nanocrystals could not be ignored.A combined activation energy estimated with the new isothermal model is 53.46 kJ/mol.