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It is shown that low-energy electron diffraction (LEED) patterns of the three high-symmetry surfaces (fivefold, threefold and twofold) of icosahedral Al-Pd-Mn are all compatible with quasicrystallinity, under specific conditions of preparation. This conclusion results from comparing symmetries of experimental surface LEED patterns with bulk X-ray diffraction data which are converted to the conditions...
We report the first surface characterization of a large, single-grain sample of quasicrystalline AlCuFe. The sample is oriented with its surface perpendicular to a five-fold axis, and has the bulk composition 63.4-24.0-12.6 at%. Following our method of preparation, the surface yields an exceptionally sharp and rich five-fold pattern in low-energy electron diffraction. The spot spacings and symmetries...
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