Hydrothermal synthesis of BaTiO₃: Crystal phase and the Ba²⁺ ions leaching behavior in aqueous medium

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• 作者：Changlong Chen ; Yuling Wei ; Xiuling Jiao ; Dairong Chen
• 关键词：Electronic materials ; Hydrothermal synthesis ; Phase transitions ; BaTiO₃
• 刊名：Materials Chemistry and Physics
• 出版年：2008
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 July 2008
• 卷：110
• 期：1
• 页码：186-191
• 文件大小：723 K

摘要

Continuous phase transition from cubic-to-tetragonal depended on reaction conditions was found in the hydrothermally synthesized BaTiO₃. The BaTiO₃ particles were characterized by powder X-ray diffraction (XRD), transmission electron microscope (TEM), high resolution TEM (HR-TEM), Raman spectra and thermal gravimetric analysis (TGA) techniques. A competitive process between the kinetic control and the thermodynamic control resulted in the crystal structure transition. In these structure-transitional products, the “cubic-rich” BaTiO₃ exhibited a stronger Ba²⁺ ions leaching ability in aqueous medium compared with the “tetragonal-rich” BaTiO₃ because the two types of samples had differences in crystal structures and the amount of lattice defects contained.