Metallic Phase with Long-Range Orientational Order and No Translational Symmetry
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TL;DR: In this article, a metallic solid with long-range orientational order, but with icosahedral point group symmetry, which is inconsistent with lattice translations, was observed and its diffraction spots are as sharp as those of crystals but cannot be indexed to any Bravais lattice.
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Abstract: 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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References
Bond-orientational order in liquids and glasses
TL;DR: In this paper, the authors studied the bond-orientational order in molecular-dynamics simulations of supercooled liquids and in models of metallic glasses and found that the order is predominantly icosahedral, although there is also a cubic component which they attribute to the periodic boundary conditions.
3.6K
Stability of a Planar Interface During Solidification of a Dilute Binary Alloy
W. W. Mullins,R. F. Sekerka +1 more
TL;DR: In this article, the stability of a moving planar liquid-solid interface during unidirectional freezing of a dilute binary alloy is theoretically investigated by calculating the time dependence of the amplitude of a sinusoidal perturbation of infinitesimal amplitude introduced into the planar shape.
3K
Quasicrystals: a new class of ordered structures
Dov Levine,Paul J. Steinhardt +1 more
TL;DR: In this article, two-and three-dimensional quasicrystals were classified by their symmetry under rotation and showed that many disallowed crystal symmetries are allowed quasici-rystal symmets.
2K
Complex alloy structures regarded as sphere packings. i. definitions and basic principles
F. C. Frank,J. S. Kasper +1 more
TL;DR: In this paper, the topological and geometrical properties of coordination polyhedra are examined and rules and theorems regarding them are deduced, and general principles regarding the combination of these polyhedral groups into full structures are given for terms that facilitate the detailed discussion of this class of structures.
1.2K
Complex alloy structures regarded as sphere packings. II. Analysis and classification of representative structures
F. C. Frank,J. S. Kasper +1 more
TL;DR: In this paper, the general principles and properties which have been deduced previously (Frank & Kasper, 1958) for the class of alloy structures are applied in an analysis and classification of representative structures.
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