Preparation And Characteration Of Nano Barium Titanate And Zirconium Barium Titanate

In the vibrant21st century, innovation of new materials, especially technologies and products based on nanomaterials, will greatly influence society development, economic growth and enhancement of national status. Preparation of inorganic nanomaterials is one of the most important parts in this strategic research field. With this in mind, we selected an important electro-ceramic material, BaTiO3-based materials, as research objects.Novel synthesis route and controllable strategy of powder properties were studied.The slurries of BaTiO3and BZT were synthesized by low temperature aquarius (LTAS) method. Pure powders with better properties were obtained after a hydrothermal treatment. The morphology and structures of the powders were investigated by XRD, TEM, SEM, and XRF, etc, which gave a strong evidence and basis to improve the preparation techniques.The content of tetragonal phase BaTiO3was increased by raising the hydrothermal temperature or prolonging the duration time, which accompanied by broad particle size distribution and various morphology. The proportion of Ba and Ti was another effect parameter to improve the content of tetragonal phase BaTiO3. Basing on the hydroxyl lattice defect, the proportion was controlled between1.3and1.6. Well dispersed BaTiO3nanoparticles with high crystallinity were obtained by adding proper amounts of NaCl, which was also good for getting tetragonal phase BaTiO3. Higher specific inductive capacity was obtained after sintering the smaller particles. The specific inductive capacity of the35-nm particle after sintering was over4000in the temperature range of25-120℃.Nano-sized BZT powders were synthesized using the same method as BaTiO3. Well dispersed BZT nanoparticles in the size range of50to100nm were prepared after hydrothermal treatment, which was with narrow particle size distribution and less hydroxyl lattice defect. The particle size can be controlled by varying the proportion of Ba and Ti. The proportion of1.3was best. Longer hydrothermal duration time and higher temperature were good for dehydroxyl. The as-synthesized BZT nano powders showed good sintering characters. The1000℃sintered ceramics illustrated excellent dielectric properties. The specific inductive capacity in room temperature was8000high and the permittivity-temperature curves broadened obviously.