纳米氧化铁晶体生长动力学研究  

Grain growth kinetics of nano-sized iron oxide

作　　者：冯宇[1] 贾磊[1] 武蒙蒙[1] 米杰[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《天然气化工—C1化学与化工》2017年第1期31-35,共5页Natural Gas Chemical Industry

基　　金：国家自然科学基金(NO.51272170)

摘　　要：采用室温固相法制备前驱体Fe_2(C_2O_4)_3·5H_2O,考察了焙烧时间、焙烧温度及焙烧保温时间对纳米氧化铁晶粒的影响,并研究了氧化铁晶粒生长动力学。使用扫描电镜、傅里叶变换红外光谱仪和X射线衍射仪对前驱体和纳米氧化铁进行表征。结果表明,对比焙烧温度和焙烧时间的影响,焙烧保温时间对氧化铁纳米晶粒的粒径影响较大,是其最主要的影响因素。通过计算,草酸铁焙烧制备纳米氧化铁的晶粒生长平均激活能为279.46kJ/mol,纳米氧化铁的晶粒生长平均动力学指数n=18.24。The room temperature solid phase method was used to prepare the precursor Fe2（C2O43· 5H2O for preparing the nano- sized iron oxide, and the effects of calcination time, temperature and its holding time on the crystals and the grain growth kinetics were investigated. The precursor and the nano-sized iron oxide were characterized by SEM, FrIR and XRD. The results show that the calcination temperature holding time has greater effect on the size of nano-sized iron oxide grain than the calcination temperature and time. In the ease of grain growth kinetics, the average activation energy is 279.46kJ/mol and the average kinetic index is 18.24.

关 键 词：纳米氧化铁 制备 晶粒生长动力学 

分 类 号：TQ426.91[化学工程]