Monoclinic Li₂TiO₃ nano-particles via hydrothermal reaction: Processing and structure

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• 作者：Cheng-Long Yu ; Kazumichi Yanagisawa ; Sumio Kamiya ; Takahiro Kozawa ; Tadaharu Ueda
• 关键词：Monoclinic Li2TiO3 fine particles ; Hydrothermal reaction ; Anatase TiO2 ; Structure ; Formation mechanism
• 刊名：Ceramics International
• 出版年：January, 2014
• 年：2014
• 卷：40
• 期：1_part_PB
• 页码：1901-1908
• 全文大小：5482 K

文摘

Pure phase Li₂TiO₃ nano-particles were synthesized via hydrothermal reaction using anatase TiO₂ and LiOH路H₂O at 200 掳C. No development of the (002) supercell diffraction peak is exhibited in the XRD pattern. In contrast, by further calcination above 500 掳C for 6 h in air, full development of the (002) supercell diffraction peak is observed. TEM observation and particle size analysis indicate that the general particle size is around 114 nm. HR-TEM observation and the 2D FFT analysis show that the layered structure corresponding to the LiTi2 layer is clearly developed. During calcination, additional Li ions diffuse into the supercell, corresponding with the diffusion of Ti ions away from the interslab into the slab, forming a more stable structure. Lithium insertion, corresponding with dissolution and precipitation mechanism is proposed for the formation of Li₂TiO₃.