Morphology transformation of barium titanate nanostructures in molten salt medium

作者：Zhou, Jiahui; Chen, Zhiwu; Lu, Zhenya; He, Xinhua; Fu, Xiaoyi^*

来源：Materials Chemistry and Physics, 2021, 273: 125094.

DOI：10.1016/j.matchemphys.2021.125094

• Barium titanate
• Nanowires
• Microsheets
• Molten salt method
• Morphological transformation

Barium titanate (BaTiO3) nanoparticles undergo a morphological transformation in a NaCl molten salt environment, beginning with nanoparticles then changing to nanowires and then microsheets, while the composition is transformed from pure BaTiO3 into a mixture of Ba2Ti6O13, Na2Ti6O13 and BaTiO3. A systematic study on the effects of calcination temperature, treatment time and the mass ratio of BT (BaTiO3)/NaCl on BaTiO3 nanoparticles morphology is reported. Here, nanowires are generated in the range of 900-1100 degrees C, while at 1200 degrees C, not only nanowires but also microsheets appear in the product. Under conditions of 1:100 BT/NaCl weight ratio, 1100 degrees C calcination temperature, and 3 h reaction time, the resulting nanowires have a smooth surface, with a diameter of 324.6 +/- 209.2 nm and a length of 20-150 mu m. It is speculated that the mechanism of nanowires formation is a dissolution-precipitation process and that the formation of the microsheets is due to the result of liquid phase sintering of BaTiO3 nanoparticles at high temperature.