HONG Xuda , WANG Xin

(School of Materials science and Engineering, South China University of Technology, Guangzhou Guangdong 510640, China)

Abstract: The preparation of water -soluble tantalum citrate was studied. Stable SBT sol and gel were synthesized using strontium nitrate, bismuth nitrate and tantalum citrate as raw materials and citric acid and EDTA as complex chelating agent, and then SBT powder and thin films were prepared. The results indicated that when the molar ratio of CA to Ta ions is 8, clear and stable tantalum citrate solution was obtained. Atmosphere had a significant impact on the pyrolysis of SBT gel. In calcinating process at different temperatures, only perovskite appeared. The surface quality of SBT thin films was good.

Keywords: sol-gel, tantalum citrate, SBT, perovskite