摘要
采用化学分析方法研究了表层掺硅Ｆｅ３Ｏ４微粒的氧化反应动力学。结果表明该反应前期为动力学控制，对［Ｆｅ２＋］为三级反应，后期为传质控制，对［Ｆｅ２＋］为一级反应；并发现随着掺硅量的增加，氧化反应速率随之增大。采用ＩＲ和ＸＲＤ方法探明了氧化过程中表层掺硅Ｆｅ３Ｏ４微粒的结构变化规律，发现掺硅导致红外吸收带向高频移动，转化率α＝０．６８是表层掺硅Ｆｅ３Ｏ４微粒氧化过程的转折点。
The kinetic study on the oxidation of surfacesiliconsubstituted magnetite ultrafine powder using chemical analysis method has been proposed. The reaction in the preliminary period is governed by kinetic process and the reaction order with respect to [Fe2+] is 3rd; while the reaction in the following period is governed by mass transfer and the reaction order with respect to [Fe2+] is first. Further studies show that with the silicon content increasing, the oxidation rate increases. The microstructure of the surfacesiliconsubstituted magnetite ultrafine powder druing oxidation process was examed by FTIR and XRD. The results show that the substitution causes the bands to shift toward high frequencies and the transition point for the oxidation process of the surfacesiliconsubstituted magnetite ultrafine powder is at the conversion ratio α=0.68.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第4期436-440,共5页
Journal of East China University of Science and Technology
基金
国家自然科学基金
关键词
掺杂
氧化铁
磁粉
氧化
动力学
doping
iron oxide
magnetic powders
oxidation
kinetics
