Kinetic Study of the Static Hydrothermal Synthesis of BaTiO3 Using Titanate Nanotubes Precursors

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• 作者：Florentina Maxim ; Paula M. Vilarinho ; Paula Ferreira ; Ian M. Reaney ; Igor Levin
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：August 3, 2011
• 年：2011
• 卷：11
• 期：8
• 页码：3358-3365
• 全文大小：1040K
• 年卷期：v.11,no.8(August 3, 2011)
• ISSN：1528-7505

文摘

A kinetic study of the growth of BaTiO₃ under hydrothermal conditions using layered titanate nanotubes as precursors has been performed at 110 and 200 掳C. At the early stages of crystallization, irrespective of temperature, pseudocubic BaTiO₃ nucleates on the surfaces of the nanotubes. Growth subsequently proceeds by a phase-boundary mechanism with exponent m 鈮?1. During this first regime, 鈥渨ild type鈥?dendritic particles form with a rough surface and a microstructure which contains planar defects. As the reaction proceeds beyond 70% completion, the nanotubes fully dissolve, and nucleation and growth of tetragonal rather than pseudocubic BaTiO₃ take place. During this second regime, the morphology of the BaTiO₃ particles remains predominantly dendritic with 鈥渟eaweed鈥?morphology and a smooth surface, but smaller spherical precipitates and particles with a small number of dendritic arms are also observed. For this stage in the hydrothermal process, the exponent, m 鈮?0.2, does not correspond to any known kinetic mechanisms.