title: Quasicrystals and noncrystallographic symmetry.
abstract: New findings on quasicrystals with icosahedral, octagonal, decagonal, and dodecagonal symmetries obtained recently in the Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, are presented. Special emphasis is put on the relation between quasicrystalline and crystalline structures. The important role played by electron diffraction and high-resolution electron microscopy in revealing these quasiperiodic structures is pointed out.
mesh_terms: D003461:Crystallography / Q000379:methods*; D004577:Electron Probe Microanalysis / Q000379:methods; D008854:Microscopy, Electron / Q000379:methods; D015394:Molecular Structure; D014961:X-Ray Diffraction