热重技术研究α-Fe_2O_3超微粒等温还原动力学及机理

Study on Isothermal Reduction Kinetics and Mechanism of Ultrafine α Fe 2O 3 Particles with TG

采用ＴＧ、ＸＲＤ、ＨＲＥＭ研究了掺硅针形超微粒α－Ｆｅ２Ｏ３在氮氢混合气中等温还原机理，并给出了等温还原动力学方程。ＴＧ研究结果表明，掺硅α－Ｆｅ２Ｏ３的等温还原过程符合缩核机理模型，ＨＲＥＭ照片也证实了这点；掺硅α－Ｆｅ２Ｏ３的等温还原动力学符合Ｅｒｏｆｅｅｖ方程。

The isothermal reduction mechanism of ultrafine α Fe 2O 3 particles doped with Si by N 2 and H 2 mixing gas was studied by techniques such as TG、 XRD、 HREM and the kinetics equation of isothermal reduction was proposed. It was found from TG investigation that the isothermal reduction process of α Fe 2O 3 particles doped with Si conforms to narrowing core model, which was also confirmed by HREM photoes. The isothermal reduction kinetics of α Fe 2O 3 particles doped with Si was found to be fitted well with Erofeev equation.