聚合物前驱体法制备铌酸钾锂粉体的研究

Research on preparing potassium lithium niobate ceramic powder by polymeric precursor method

采用聚合物前驱体法制备了KLN纳米陶瓷粉体。研究了不同pH值、不同柠檬酸与金属离子物质的量比（CA：M^n＋）以及不同退火温度对K-Li-Nb溶胶稳定性以及粉体组成的影响。实验结果表明：K-Li-Nb凝胶热分解过程分为3个阶段，KLN的生成温度在590～620℃左右：当柠檬酸与金属离子物质的量比（CA：M^n＋）为3：l，前驱体溶液pH值控制在6～10内可以得到均匀透明的溶胶。pH=10的前驱体凝胶在850℃下煅烧后得到较纯的KLN纳米陶瓷粉体。

The potassium lithium niobate ceramic powder was prepared by the polymeric precursor method. Influence of different pH value, the mass ratio of CA/M on the stability of the K-Li-Nb precursor sol and the phase constitution were studied. The results showed that the thermal decomposition of the K-Li-Nb precursor gel included three stages. KLN could be synthesized at about 590-620℃. Homogeneous K-Li-Nb precursor solution and sol with no precipitate could be achieved at pH=7-10, with the molar ratio of metal cations/CA=3/1 and CA/EG=2/3. KLN powders could be obtained at a calcined temnerature of 850℃.