F. Krumeich, M. Conrad, H. Nissen
Nov 1, 1998
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0
Influential Citations
22
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Journal
Philosophical Magazine Letters
Abstract
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...