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用双重熔盐法制备片状Bi4Ti3O12粉体,以Bi4Ti3O12为中间产物通过离子交换制备了BaTiO3片状粉体,并对其工艺过程进行了优化。利用X射线衍射分析合成粉体的相结构,用扫描电子显微镜观察其显微形貌。初步探讨了BaTiO3片状粉体的生长机理。结果表明:反应温度和化学组成对中间产物Bi4Ti3O12的微观形貌具有显著影响,在1000℃以下时,随着反应温度升高,片状尺寸增大;当相对增加Bi2O3的量时,Bi4Ti3O12片状的尺寸增大。通过离子交换制备BaTiO3时,除了模板Bi4Ti3O12的形貌对BaTiO3的晶粒生长具有影响外,反应温度和化学组成同样对BaTiO3的晶粒生长具有显著影响。合成片状Bi4Ti3O12粉体的最佳的条件为:BaTiO3与Bi4Ti3O12的摩尔比为10:1,1000℃合成2h。
The flaky Bi4Ti3O12 powder was prepared by double molten salt method. BaTiO3 flake powder was prepared by ion exchange using Bi4Ti3O12 as the intermediate product, and its process was optimized. The phase structure of the synthesized powder was analyzed by X-ray diffraction and its microstructure was observed with a scanning electron microscope. The growth mechanism of BaTiO3 flake powder was preliminarily discussed. The results show that the reaction temperature and chemical composition have significant influence on the microstructure of Bi4Ti3O12. When the temperature is below 1000 ℃, the size of the sheet increases with the increase of reaction temperature. When the amount of Bi2O3 is relatively increased, The size of the increase. When BaTiO3 was prepared by ion exchange, the reaction temperature and the chemical composition also had a significant effect on the grain growth of BaTiO3 except that the morphology of the template Bi4Ti3O12 had an effect on the grain growth of BaTiO3. The optimum conditions for the synthesis of flaky Bi4Ti3O12 powder are as follows: the molar ratio of BaTiO3 and Bi4Ti3O12 is 10: 1,1000 ℃ for 2h.