Phase evolution of bismuth ferrites in the process of hydrothermal reaction

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• 作者：Dengrong Cai ; Jianmin Li ; Tong Tong ; Dengren Jin ; Shengwen Yu ; Jinrong Cheng ; ^{jrcheng@staff.shu.edu.cn}
• 关键词：Bismuth ferrites ; Phase evolution ; Hydrothermal reaction
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 May, 2012
• 卷：134
• 期：1
• 页码：139-144
• 文件大小：1824 K

摘要

Bismuth ferrite crystallites were prepared by the hydrothermal method. The phase evolution in the process of hydrothermal reactions was investigated for different conditions. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicates that sillenite Bi₂₅FeO₄₀ could be the intermediate products, while perovskite BiFeO₃ was the target crystallite. The phase evolution could be controlled by adjusting KOH concentration, reaction temperature and duration time et al. The dissolution of Fe(OH)₃ plays an important role to control the phase formation of bismuth ferrites. Bi₂₅FeO₄₀ and BiFeO₃ crystallites have the cubic and sphere-like morphologies respectively. The formation of perovskite BiFeO₃ crystallites was based on the dissolution of sillenite Bi₂₅FeO₄₀.