Effects of Surface Area of Titanium Dioxide Precursors on the Hydrothermal Synthesis of Barium Titanate by Dissolution鈥揚recipitation

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• 作者：Ki Ho Ahn ; Young-Ho Lee ; Minsoo Kim ; Hong-shik Lee ; Yong-Suk Youn ; Jaehoon Kim ; Youn-Woo Lee
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：September 18, 2013
• 年：2013
• 卷：52
• 期：37
• 页码：13370-13376
• 全文大小：504K
• 年卷期：v.52,no.37(September 18, 2013)
• ISSN：1520-5045

文摘

We have attempted to study the formation of BaTiO₃ by hydrothermal synthesis and our experiments reveal the reaction by dissolution鈥損recipitation as the dominant operating mechanism. Two major formation mechanisms of BaTiO₃ by hydrothermal synthesis involving either in situ transformation or dissolution鈥損recipitation have been previously proposed. However, the exact formation mechanism is yet to be clarified unambiguously. To investigate the mechanism in detail, we used Ba(OH)₂ and three types of TiO₂ nanoparticles as precursors for the synthesis. The morphology of the BaTiO₃ obtained was cubic (with rounded edges), regardless of the morphology of the TiO₂ used, which indicated that the synthesis followed the dissolution鈥損recipitation mechanism. In this mechanism, the surface area of TiO₂, which affects its dissolution rate, played a critical role in determining the crystal size of the BaTiO₃ product. In this paper, we have also discussed the effects of the synthesis conditions on BaTiO₃ particle formation.