凝胶燃烧法制备CuAlO_2粉末及机理研究

Complexation mechanism of CuAlO_2 powders by gel-combustion

以三水硝酸铜和九水硝酸铝为原料、柠檬酸为络合剂和助燃剂,采用凝胶燃烧法制备了CuAlO2粉末。采用红外光谱分析、差热分析、X射线衍射、纳米粒度分析等测试手段,研究制备过程中的络合比、PH值、溶剂对凝胶和CuAlO2相的形成的影响。结果表明:以去离子水为溶剂、络合比为1∶1、PH值为0.67、凝胶燃烧后的产物经1 100℃煅烧4 h可得纯CuAlO2相粉末,颗粒平均大小约190 nm;柠檬酸与金属离子在水溶液中以单齿方式进行络合,形成三围网络结构,实现了凝胶化均质转变。

The CuAlO2powders were prepared by gel combustion using copper nitrate and aluminum nitrate as raw material,and citric acid as fuel and complexing agent. The effects of processing parameters,such as complexation, PH value and solvent on the gel and the single phase of CuAlO2formation were investigated using IR,DSC,XRD and Nano-size analysis. The results show that pure CuAlO2powders can be obtained after sintered at 1 100 ℃ for 4 h by using deionized water as the solvent,and setting complexation ratio to 1∶ 1,PH value to 0. 67. The average particle size is about 190 nm. Citric acid combines metal ions to form complexes with unidentate manner in aqueous solution and constitute the network structure,in which a homogeneous gel transition has been achieved.