Abstract
A new structural model of an Al72Ni20Co8 decagonalquasicrystal is constructed on the basis of high-angle annular dark-fieldimages and high-resolution electron microscope images.The model is composed of two types of atom clusters with about a 0.4, nmradius as basic structural units, which are similar to the unit existing inthe Al13Fe4 monoclinic approximant.The two clusters are located at the lattice points of the rhombic Penroselattice.The model satisfies the symmetry of space group P105/mmc.High-resolution electron microscope images calculated from the model agreewell with the experimental ones.
