Abstract
The analysis of high-resolution electron-microscopy images of the stable ${\mathrm{Al}}_{62}$${\mathrm{Cu}}_{20}$${\mathrm{Co}}_{15}$${\mathrm{Si}}_{3}$ decagonal quasicrystal shows a long-range aperiodic translation order similar to that of Penrose tiling. Thus this particular decagonal phase could be interpreted as a phason-perturbed quasiperiodic crystal.
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