Hydrothermal Synthesis Nano-Size BaTiO3 Used Solvent to Control Crystal Growth

• Main Authors: Jian-Chuen Chen, 陳建淳
• Other Authors: Sea-Fu Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/j4447q

博士 === 國立臺北科技大學 === 材料科學與工程研究所 === 102 === In this study, the particle size of barium titanate was controlled by different concentration of methanol, ethanol, propa-1-ol, isopropanol and tret-butanol under hydrothermal condition. Experiences results showed by several analysis, using X-Ray diffractometer analyzed the barium titanate crystal phase, and scanning electron microscopy observed the microstructure for particle morphology, and Raman spectroscopy analyzed the residual TiO2 、lattice stress and OH- defects. Other results included particle size distribution, phase transformation of non-thermal activation and internal defects and lattice constant variation. The results showed that tetragonal structure transformed to cubic structure against nano particle size. And the OH- defects of structure caused the lattice constant larger than theoretical value slightly. For the results showed the barium titanate crystal had internal stress for OH- defects induced. The results showed the stress of crystal lattice increased with decreased particle size. The two important results of uniform particle size distribution and crystal type obtained by using alcohol as part of solvent to form nano size barium titanate in hydrothermal synthesis.