无机化学学报

草酸还原法制备VO₂(英文)

Preparation of VO₂ by Oxalic Acid Reduction Method

作者	单位
安鑫鑫	陕西师范大学化学与材料科学学院，陕西省大分子科学重点实验室，西安 710062 北京分子科学国家实验室，北京大学化学与分子工程学院，稀土材料化学与应用国家重点实验室，北京 100871
荆西平	北京分子科学国家实验室，北京大学化学与分子工程学院，稀土材料化学与应用国家重点实验室，北京 100871
焦　桓	陕西师范大学化学与材料科学学院，陕西省大分子科学重点实验室，西安 710062

摘要: 利用草酸还原五氧化二钒的方法制备系列低价钒氧化合物。将混匀的原料置于高纯N₂洗气后的石英管中，600 ℃反应 2 h，n_V₂O₅∶n_H₂C₂O₄在1∶0.5至1∶2.5范围变化时，可以分别得到单一物相的V₆O₁₃，VO₂和V₂O₃粉体。通过XRD，XPS，EPR，电阻测量及磁性测试等手段对VO₂样品进行了表征，结果显示VO₂样品在65 ℃附近发生从半导体到金属的相变，并且其电学和磁学性质变化与文献报道基本一致。

关键词: VO₂ 制备草酸还原

基金项目:

Abstract: Oxalic acid reduction method was developed for preparing vanadium oxides with various low vanadium valence states by heating the mixture of vanadium pentoxide(V₂O₅) with suitable amounts of oxalic acid(H₂C₂O₄) in sealed quarts tube under high-purity N₂ at 600 ℃ for 2 h. When the molar ratio of V₂O₅ to H₂C₂O₄ was varied from 1∶0.5 to 1∶2.5, pure phase samples V₆O₁₃, VO₂ and V₂O₃ could be obtained. The VO₂ sample was characterized by XRD, XPS, EPR as well as electric and magnetic measurements. The title material has a structure phase transition around 65 ℃, corresponding to a semiconductor-to-metal transition. With this transition, the resistivity and magnetic susceptibility are with discontinuous change near the phase transition temperature, in reasonable agreements with the reported data.

Keywords: VO₂ preparation oxalic acid reduction

摘要点击次数: 1340

全文下载次数: 1835

安鑫鑫,荆西平,焦　桓.草酸还原法制备VO₂(英文)[J].无机化学学报,2010,26(7):1159-1164.

查看全文查看/发表评论下载PDF阅读器

Support information: