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。
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.
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