还原五氧化二钒制备二氧化钒粉末

Preparation of VO_2 Powder by Deoxidizing V_2O_5

本文采用碳热法还原V2O5制备钒的低价氧化物VO2。用XRD分析生成物的相结构,用DSC/TGA的分析结果推测反应历程。结果表明:反应经历了674°C-710°C期间生成V6O13和710°C以上完全形成VO2的过程。将VO2与LAS玻璃复合烧结成陶瓷,对其进行阻温测试,结果表明:在室温至100°C间复合陶瓷电阻急骤下降,这是由VO2的半导体-金属相变效应引起的。

Carbon was chosen as the reductant to prepare VO2 from V2O5. XRD method was applied to analyze the phases of the intermediate and final products. DSC/TGA was used to study the route of the reduction proceeded. The results show that the reaction was proceeded from the formation of V6O13 at 674 ℃ ～710 ℃ and the complete formation of VO2 above 710 ℃. And resistance-temperature performance of VO2/LAS composite test was found a sharp decrease of the resistivity from room temperature to 100 ℃, which was believed due to the metal-semiconductor phase transition.