The mesoscopic structure of disordered dodecagonal tantalum telluride: A high-resolution transmission electron microscopy study
The mesoscopic structure of disordered dodecagonal tantalum telluride: A high-resolution transmission electron microscopy study
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DOI：
10.1080/095008398177751
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发表时间：
1998-11
影响因子：
1.2
通讯作者：
F. Krumeich;M. Conrad;H. Nissen;B. Harbrecht
中科院分区：
文献类型：
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作者：
F. Krumeich;M. Conrad;H. Nissen;B. Harbrecht
采用传统的高温合成技术，在相应的准晶相的热稳定性上限处制备了无序十二方相的富钽碲化物。用高分辨电子显微镜(HRTEM)在介观尺度上研究了无序碲化物的结构。为了产生HRTEM图像，采用了一种选择性成像技术，该图像允许识别长度尺度约为2 nm的结构下的方形-三角形瓷砖。该瓷砖被分析了与完美有序的十二方晶碲化物和各种晶体近似物的特定偏差。应用从两个特征良好的近似物的结构导出的一般构造原理，可以重建无序十二方相的真实结构模型并计算其组成。这种无序相被解释为一种干涉。
A disordered dodecagonal quasicrystalline tantalum-rich telluride was prepared at the upper thermal stability limit of the related quasicrystalline phase by application of conventional high-temperature synthesis techniques. The structure of the disordered telluride was studied on a mesoscopic scale by means of high-resolution transmission electron microscopy (HRTEM). A selective imaging technique was employed in order to produce HRTEM images which allow a square-triangle tiling underlying the structure on a length scale of about 2 nm to be recognized The tiling was analysed with regard to specific deviations from a perfectly ordered quasicrystalline dodecagonal telluride and various crystalline approximants. The application of a general construction principle derived from the structures of two well characterized approximants allows the reconstruction of a realistic structural model for the disordered dodecagonal phase and the calculation of its composition. The disordered phase is interpreted as an interg...