高能球磨Si还原V2O5的固相反应

Soild-state reduction of V2O5/Si through high-energy milling

采用机械还原的方法以Si／V2O5为原料直接制VO2／SiO2复合陶瓷粉，主要探讨了高能球磨实现固相反应的动力学条件。利用X射线衍射仪和扫描电镜分析了不同球磨时间粉末的物相、形貌及结构变化，结果表明，球磨25hV2O5衍射峰消失，36h发生固相还原反应生成新相VO2。随着球磨的进行，V2O5的层状结构断裂，表面吸附小颗粒更均匀化，晶格常数发生明显改变，为室温下发生固相还原反应提供新增表面能、减小反应物之间的接触距离以及歧变能。

A composite consisting of VO2 and SiO2 was prepared by Si and V2O5 using high-energy ball milling.This paper studed the process and kinetics of solid -state reduction by high-energy milling at room temperature.XRD（X-ray diffraction） and SEM （scanning electron microscopy） showed the following results： the diffraction peak of V2O5 dispeared at milling 25h; reaction started at milling 36h and V2O5 were reduced to VO2. Before reaction,there is 25h for storing distortion and new surface energy with changs of lattce constants and broken layers of V2O5 particles by high-energy milling.