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We have observed a metallic solid (Al-14-at.%-Mn) with long-range orientational order, but with icosahedral point group symmetry, which is inconsistent with lattice translations. Its diffraction spots are as sharp as those of crystals but cannot be indexed to any Bravais lattice. The solid is metastable and forms from the melt by a first-order transition.
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D. Shechtman
I. A. Blech
D. Gratias
Physical Review Letters
Centre National de la Recherche Scientifique
National Institute of Standards and Technology
Technion – Israel Institute of Technology
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Shechtman et al. (Mon,) studied this question.
www.synapsesocial.com/papers/69d9b8df0d540cafc583740e — DOI: https://doi.org/10.1103/physrevlett.53.1951