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无机材料学报

• 研究论文 • 上一篇    下一篇

纳米VO2粉体的制备及性能特征

傅群1; 储向峰1; 林晨1; 雷德铭2; 郑臣谋1   

  1. 1. 中山大学化学与化学工程学院; 2. 中山大学物理系; 广州 510275
  • 收稿日期:2003-06-30 修回日期:2003-08-14 出版日期:2004-07-20 网络出版日期:2004-07-20

Preparation of VO2 Nanopowders and Their Properties

FU Qun1; CHU Xiang-Feng1; LIN Chen1; LEI De-Ming2; ZHENG Chen-Mou1   

  1. 1.School of Chemistry and Chemical Engineering; 2.Department of Physics; Sun Yat-Sen University; Guangzhou 510275; China）
  • Received:2003-06-30 Revised:2003-08-14 Published:2004-07-20 Online:2004-07-20

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摘要： 应用氧钒(Ⅳ)碱式碳酸铵(NH4)5[(VO)6(C2O3)4(OH)9]·10H2O为前驱体,低温下在空气和氮气的混合气流中热分解,制得不同整比性、不同结晶态的纳米VO2粉体。研究结晶态、准结晶态和无定形纳米VO2粉体对气体的吸附性能。DSC测定结果表明VO2.025在70.1℃出现相变并且在VO1.958-VO2.071范围内具有最大相变热。测定了不同整比VOx的晶胞参数,单斜VO2的晶胞体积从缺氧VO2到富氧VO2线性增加。

关键词: 二氧化钒纳米粉体, 整比性, 相变热, 晶胞参数

Abstract: VO2 nanopowders with various stoichiometries and crystalline states were prepared by pyrolyzing the
precursor, (NH4)5[(VO)6(CO3)4(OH)9]·10H2O, at low temperature in a mixed flow of air and N2. The adsorption properties of
crystal, quasi-crystal and amorphous state nano-VO2-powders were studied. DSC results indicate that VO2.025 exhibits a phase transition at
70.1℃ and has the maximum phase transition heat in the range from VO1.985 to VO2.071. The unit-cell parameters of various stoichiometry VOx were determined. The results show that the unit-cell volume of the monoclinic VOx phase increases linearly from
the oxygen-deficient VO2 to the oxygen-rich VO2.

Key words: VO2 nano-powder, stoichiometry, phase transition heat, unit-cell parameter

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