Abstract
Thin films of Al-Mn, Al-Fe and Al-Cu-Fe quasicrystalline films are prepared by a successive deposition technique in a vacuum onto air-cleaved sodium chloride surfaces at substrate temperatures of 220–350°C. The growth of the quasicrystals is found as grains of 20–50 nm in size, the five-fold axis being perpendicular to the film surface and the two-fold axis of the quasicrystal parallel to [110] directions of the (111) orientated aluminum film. For the Al-Fe and Al-Cu-Fe system, the rotation of the five-fold axis around the two-fold axes by around 10° can be recognized. Below about 10 at % of manganese or iron content, a coexistence of aluminum and the quasicrystalline grains is observed. High resolution electron microscopy is applied to the quasicrystal films, by which the vertex model with a decoration in Penrose tiling is suggested.
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