Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties · 1996 · 121 citations · 27 references
Natural SciencesMaterials ScienceCondensed Matter PhysicsCrystal StructureSolid-state ChemistryCrystal PlanesCrystal SymmetryCrystal SystemsCrystallographyStructure DeterminationX-ray CrystallographyCrystal Structure AnalysisCrystal Structure DeterminationOrthorhombic SystemQuasicrystalsStructure SolutionUnit Cell Parameters
Abstract The structure of an orthorhombic phase (ξ′ phase) with Al73·5Pd224Mn4·1 composition was solved by applying the direct methods and refined by a least-squares procedure. The space group is Pnma and the magnitudes of cell parameters are a = 23·541 Å, b = 16·566 Å and c = 12·339 Å. The final reliability factor is R = 0·072 for 3419 independent reflections. The structure is made up of partial Mackay icosahedra in which the Pd atoms form icosahedra centred on Mn atoms. These central Mn atoms are located at the vertices of flattened hexagons arranged in quincunx. The ξ′ phase is nearly isomorphic to the Al3Pd structure and has a layer structure consisting of flat and puckered layers similar to what is found in Al3Mn and Al13Fe4.
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Metallic Phase with Long-Range Orientational Order and No Translational Symmetry
D. Shechtman, I. A. Blech, D. Gratias et al. · Physical Review Letters · 1984 · 7K citations · Full text
A dense non-crystallographic packing of equal spheres
A. L. Mackay · Acta Crystallographica · 1962 · 1.2K citations