Philosophical Magazine Letters · 2001 · 22 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureMaterials PhysicsCrystal SystemsCrystallographyElectron DiffractionElectron MicroscopyTransmission Electron MicroscopyX-ray CrystallographyCrystallographic CharacterizationDiffraction PatternsElectron CrystallographyElectron Diffraction Of QuasicrystalsQuasi-crystalsQuasicrystalsScanning Transmission Electron MicroscopyTransition Metal Clusters
An Al-Ni-Co pentagonal quasicrystal, showing electron diffraction patterns with pentagonal symmetry and including so-called superlattice reflections, has been examined by the high-angle annular detector dark-field technique with scanning transmission electron microscopy. Columnar clusters with a pentagonal arrangement of transition-metal atoms around their centres are arrayed in a rhombic tiling with a bond length of 2nm, all the clusters having the same orientation of pentagonal symmetry.