Andrusenko Iryna, Mugnaioli Enrico, Gorelik Tatiana E, Koll Dominik, Panthöfer Martin, Tremel Wolfgang, Kolb Ute
Institut für Physikalische Chemie der Johannes Gutenberg-Universität, Mainz, Germany.
Acta Crystallogr B. 2011 Jun;67(Pt 3):218-25. doi: 10.1107/S0108768111014534. Epub 2011 May 14.
A hitherto unknown phase of sodium titanate, NaTi(3)O(6)(OH)·2H(2)O, was identified as the intermediate species in the synthesis of TiO(2) 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. NaTi(3)O(6)(OH)·2H(2)O crystallizes in the monoclinic space group C2/m. Corrugated layers of corner- and edge-sharing distorted TiO(6) 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.
一种迄今未知的钛酸钠相，NaTi(3)O(6)(OH)·2H(2)O，被确定为TiO(2)纳米棒合成过程中的中间物种。这种以纳米棒形式制备的新相通过电子衍射、X射线粉末衍射、热重分析和高分辨率透射电子显微镜进行了研究。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确定了其结构。NaTi(3)O(6)(OH)·2H(2)O结晶于单斜空间群C2/m。由角共享和边共享的扭曲TiO(6)八面体组成的波纹层被Na(+)和结晶水插入。纳米棒通常受到普遍存在的缺陷影响，如相互层位移，这会沿c*产生衍射条纹。此外，在高分辨率透射电子显微镜图像中观察到了边缘位错。
