Monoclinic Li2TiO3 nano-particles via hydrothermal reaction: Processing and structure
Monoclinic Li2TiO3 nano-particles via hydrothermal reaction: Processing and structure
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DOI：
10.1016/j.ceramint.2013.07.097
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发表时间：
2014-01-01
影响因子：
5.2
通讯作者：
Ueda, Tadaharu
中科院分区：
文献类型：
--
作者：
Yu, Cheng-Long;Yanagisawa, Kazumichi;Ueda, Tadaharu
以锐钛矿TiO2和LiOH中心点H2O为原料，在200℃下水热反应合成了纯相Li2TiO3纳米颗粒，XRD图中没有（002）超级单体衍射峰。相比之下，在500℃以上的空气中进一步煅烧6小时，观察到（002）超级单体衍射峰的充分发育。TEM观察和粒度分析表明，该材料的粒径在114 nm左右。hrtem观察和二维FFT分析表明，LiTi2层对应的层状结构明显发育。在煅烧过程中，额外的Li离子扩散到超级单体中，与Ti离子从板间向板内扩散相对应，形成了更稳定的结构。提出了Li2TiO3形成的锂插入、溶解和沉淀机制。(C) 2013 Elsevier Ltd and Techna Group S.r.l版权所有
Pure phase Li2TiO3 nano-particles were synthesized via hydrothermal reaction using anatase TiO2 and LiOH center dot H2O at 200 degrees C. No development of the (002) supercell diffraction peak is exhibited in the XRD pattern. In contrast, by further calcination above 500 degrees 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. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.