Structure analysis of titanate nanorods by automated electron diffraction tomography
Structure analysis of titanate nanorods by automated electron diffraction tomography
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DOI：
10.1107/s0108768111014534
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发表时间：
2011-06-01
影响因子：
1.9
通讯作者：
Kolb, Ute
中科院分区：
文献类型：
--
作者：
Andrusenko, Iryna;Mugnaioli, Enrico;Kolb, Ute
一种迄今未知的钛酸钠相，NaTi 3 O 6（OH）中心点2 H（2）O，被确定为合成TiO 2纳米棒的中间物种。通过电子衍射、X射线粉末衍射、热重分析和高分辨透射电子显微镜对这种纳米棒状的新相进行了研究。使用最近开发的自动衍射断层扫描技术收集的电子衍射数据从头开始确定的结构。NaTi_3O_6（OH）中心点为2 H（2）O，空间群为C_2/m。波纹层的角落和边缘共享扭曲的TiO 6八面体插入Na+和结晶水。纳米棒通常受到普遍缺陷的影响，例如相互层移位，其产生沿沿着c* 的衍射条纹。此外，在HRTEM图像中观察到刃位错。
A hitherto unknown phase of sodium titanate, NaTi3O6(OH)center dot 2H(2)O, was identified as the intermediate species in the synthesis of TiO2 nanorods. This new phase, prepared as nanorods, was investigated by electron diffraction, X-ray powder diffraction, thermogravimetric analysis and high-resolution transmission electron microscopy. The structure was determined ab initio using electron diffraction data collected by the recently developed automated diffraction tomography technique. NaTi3O6(OH)center dot 2H(2)O crystallizes in the monoclinic space group C2/m. Corrugated layers of corner- and edge-sharing distorted TiO6 octahedra are intercalated with Na+ and water of crystallization. The nanorods are typically affected by pervasive defects, such as mutual layer shifts, that produce diffraction streaks along c*. In addition, edge dislocations were observed in HRTEM images.