摘要：为了探寻价廉、高效合成纳米钛酸钡粉体的方法,以TiCl₄和BaCl₂为主要原料,采用微波法一步合成纳米钛酸钡粉体,采用X射线衍射谱、扫描电镜、漫反射吸收谱、介电损耗谱和热重-差热分析对钛酸钡粉体进行表征。结果表明,合成的钛酸钡粉体为纯的立方相纳米粉体,颗粒大小均匀,分散性好,晶粒度约为90 nm;纳米钛酸钡粉体的禁带宽度为3.4 eV,具有良好的介电性能;纳米钛酸钡粉体中立方相BaTiO₃在1 000℃煅烧后才有部分转化成四方相BaTiO₃,表现出良好的热稳定性。

关键词：纳米钛酸钡粉体；微波法；介电性能；热稳定性

Abstract：To explore a cheap and efficient method of synthesizing BaTiO₃nano-particles, BaTiO₃ nano-particles were synthesized by the microwave method taking TiCl₄ and BaCl₂ as main raw materials. The BaTiO₃nano-particles were characterized by XRD, SEM, DRS, dielectric loss spectrum and TG -DTA. The results show that the synthesized BaTiO₃nano-particles were pure cubic crystal phase with uniform particle size of about 90 nm and good dispersion. The BaTiO₃ nano-particles show excellent dielectric properties with band gap of 3.4 eV. A part of cubic phase BaTiO₃ are transformed into tetragonal structure after calcining at 1 000 ℃， so the synthesized BaTiO₃ nano-particles show a good thermal stability. 

Keywords: BaTiO₃ nano-particle; microwave method; dielectric property; thermal stability