镧钴氧化物合成的溶胶凝胶形成过程分析

Research on sol-gel process for lanthanum and cobalt oxides synthesis

着重研究了柠檬酸对溶胶凝胶法合成LaxCo2-xO3-δ的凝胶形成过程的影响,通过分析溶液颜色变化与钴配位环境的关系,阐明溶液体系pH值、陈化时间对凝胶形成的影响作用。根据凝胶的红外谱图分析了凝胶中金属离子与柠檬酸的配位方式,以及论证了凝胶体系是由金属离子与柠檬酸相互连接而形成的网络结构。

The effects of citrate sol-gel on the gelating process of LaxCo2-xO3-δ synthesis were studied. The relationship between solution colour and coordinated environment of Co ions, the effect of pH values, keeping temperature and time on the forming of citrate-gel, and the coordination of metal ions with citrate acid were analyzed. The results indicate that the formed through the coordination bonds between metal cations and the citric confirmed by IR-spectrum analysis.