抄録
As for the particle formation process, it is important both to synthesize nanoscale product and to dry without agglomerating. In this study, we synthesize the nanoscale barium titanate via sol-gel process with titanium isopropoxide and barium hydroxide chemicals. Grinding and stepwise temperature gradient are adjusted during the drying process. Moreover, the effect of different solvents, concentration and aging time are also discussed. The barium titanate powder obtained in this study is about 20∼40nm with 89% yielding. We find that grinding after calcining at 400°C will lead to lower the particle size and sharper particle size distribution. Grinding and stepwise heating will avoid agglomeration. The X-ray diffractometer result reveals that the nanoscale barium titanate synthesized in this study equips crystallinity after calcining at temperature beyond 600°C. After calcining at 800°C, it shows fully cubic perovskite structure without tetragonal phase. It is believed that the barium titanate crystallite size is smaller than critical grain size and results in pure cubic perovskite phase in this study.
