Abstract
X-ray “single” crystal precession photographs of an Al63.5Cu24Fe12.5 alloy of icosahedral symmetry are presented [1]. All the diffraction peak positions are interpreted within the framework of a very simple microcrystalline model in which coherent crystalline domains having particular orientational relationships restore the icosahedral symmetry on diffraction patterns. A quasicrystalline model in which phason fields are introduced is also discussed.
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