Fe2O3/TiO2扩散偶的固相反应

摘要

采用扩散偶的方法研究了Fe2O3和TiO2在1373K空气气氛不同时间下的固相反应.采用场发射扫描电镜对扩散偶表面形貌进行观察和线扫描能谱分析.根据线扫描能谱分析所得的组元扩散浓度曲线,用DenBroeder改进的Boltzmann-Matano法计算出Fe2O3/TiO2扩散偶的互扩散系数,结果发现互扩散系数与Fe3+浓度呈一定的线性关系,并随着Fe浓度的升高而增大,同时用空位扩散机理讨论了Fe2TiO5的形成.%The solid-state reaction of the Fe2O3/TiO2 system at 1373K for different time in air was studied by a diffusion couple method. The surface morphology of diffusion couple was observed by the field emission scanning electron microscope and the line scan energy spectrum was also analyzed. According to the diffusion concentration curve of elements from line scanning analysis, Boltzmann-Matano method improved by Den Broeder was used to calculate the interdiffusivity of the Fe2O3/TiO2 system. It is found that there is a linear relationship between the concentration of Fe3+ and the interdiffusivity which increases with the concentration of Fe increasing, meanwhile the formation mechanism of Fe2 TiO5 was also discussed by the vacancy diffusion mechanism.