钛酸铋纳米粉体的水热合成及表征

Synthesis and Characterization of Bi_4Ti_3O_(12) Powders by Hydrothermal

采用分析纯Bi(NO3)3.5H2O和TiO2为原料,以NaOH为矿化剂,用水热法合成了钛酸铋纳米粉体。讨论了水热反应温度和晶化时间对钛酸铋粉体结构和形貌的影响。研究结果表明,随着水热温度的提高及晶化时间的延长,晶体结晶程度提高;在140～180℃和30～72h的水热条件下,合成了纯的Bi4Ti3O12粉体,其主要由方形片状的纳米晶组成,为典型的钙钛矿结构。并结合实验结果探讨了钛酸铋的水热合成机理。

The Bi4Ti3O12 powders were hydrothermally synthesized from Bi （NO3 ）3 ＂ 5H20, TiO2 and NaOH solution. The influence of hydrothermal conditions （ including reaction temperature and time） on the crystal structure and the morphology of BiaTi3O12 particles were studied. The results revealed that the crystallinity of Bi4Ti3O12 powders was improved with rising reaction temperature and time. The pure Bi4Ti3O12 powders with a typical bismuth layered perovskite structure were hydrothermally synthesized at temperatures of 140-180℃ for 30-72 h. The as-prepared BiaTi3O12 powders were generally nanoplate in shapes. Through the XRD, FT-IR spectra and SEM characterization, the hydrothermal formation mechanisms of BinTi3O12 nanopowders was elucidated.