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在氩气气氛下,采用扩散偶法研究了1323~1473K下的Fe2O3-TiO2体系的固相反应.使用电子探针对扩散偶的微观形貌进行观察,并对Fe、Ti离子的扩散摩尔分数曲线进行定量分析.动力学分析表明,氩气下体系的固相反应受铁、钛和氧离子的扩散控制.用Boltzmann-Matano法计算了体系的互扩散系数,其数量级在10-13~10-10cm2·s-1范围内,并随着温度和Ti离子摩尔分数的增大而升高.氩气气氛下体系的扩散活化能约为356.06 kJ·mol-1,远比空气下的大,表明外界气氛中氧分压对体系的反应机理有重要影响.
Under argon atmosphere, the solid-state reaction of Fe2O3-TiO2 system at 1323-1473K was studied by using diffusion-coupled method.The microscopic morphology of the diffusion couple was observed by electron probe and the diffusion mole fraction of Fe and Ti ions Curve was used for the quantitative analysis.The kinetic analysis showed that the solid state reaction under argon was controlled by the diffusion of iron, titanium and oxygen ions.The interdiffusion coefficient of the system was calculated by Boltzmann-Matano method, the order of magnitude was 10-13 ~ 10 -10cm2 · s-1 and increases with the increase of temperature and mole fraction of Ti ion.The diffusion activation energy of the system under argon is about 356.06 kJ · mol-1, which is much larger than that under air, It shows that the partial pressure of oxygen in the external atmosphere has an important influence on the reaction mechanism of the system.