SHAO Zhipeng 1, JIANG Weihui 1, 2, FENG Guo 2, LIU Jianmin 2, MIAO Lifeng 2, ZHANG Quan 2, WU Qian 2
(1. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. National
Engineering Research Center for Domestic and Building Ceramics, Jingdezhen 333001, Jiangxi, China)
Abstract: BaTiO3 (BT) nano powders were prepared via precipitation method and non-hydrolytic sol-gel (NHSG) method by using barium acetate and titanium tetrabutoxide as precursors, respectively. The process of BT phase transformation and the reaction mechanism of these two methods were researched by DTA-TG, XRD, FTIR, TEM, etc. The results show that BT nano powder can be synthesized at 750 ℃ via precipitation method using deionized water and ethonal as complex solvent, acetylacetone as chelating agent, and urea as precipitant; it can also be synthesized at 650 ℃ via NHSG method using glycerol as solvent; FT-IR indicates that the synthesis mechanism of NHSG method for BT nanopowders is different from that of precipitation method, the Ti-OH and CO3 2-characteristic peaks were presented via precipitation method, while the Ba-O-Ti heterogeneous bond was formed in the de-esterification of polycondensates via NHSG method, and then the xerogel was turned into the BT nanocrystalline directly after calcination. Therefore, the BT nanopowders were obtained at low temperature.
Key words: barium titanate; nano powder; precipitation method; non-hydrolytic sol-gel method; Ba-O-Ti heterogeneous bond