Journal ArticleDOI
Neutron-diffraction approach to the atomic decoration of the Al-Mn icosahedral quasicrystal.
Reads0
Chats0
TLDR
In this article, neutron-diffraction data were obtained from single-phase icosahedral powder of the system and its modification by isomorphous substitution on the Mn sites.Abstract:
Neutron-diffraction data were obtained from single-phase icosahedral powder of the system ${\mathrm{Al}}_{74}$${\mathrm{Si}}_{5}$${\mathrm{Mn}}_{21}$ and its modification by isomorphous substitution on the Mn sites. Amplitudes and phase differences of the partial structure factors (${F}_{\mathrm{Al}}, {F}_{\mathrm{Mn}}$) were determined. From their ${Q}_{\ensuremath{\perp}}$ dependences, and within a strip-projection approach, phases were reconstructed. Atomic densities calculated in the physical 3D space show that Mackay icosahedra, the structural units usually invoked for quasicrystal models, do not emerge as the basic ingredients of the atomic arrangements.read more
Citations
More filters
Journal ArticleDOI
Neutron and X-ray single-crystal study of the AlPdMn icosahedral phase
Michel Boudard,M. de Boissieu,Christian Janot,G. Heger,C. Beeli,H.-U. Nissen,H. Vincent,R Ibberson,Marc Audier,Jean-Marie Dubois +9 more
TL;DR: In this paper, a model is proposed as deduced from a six-dimensional (6D) Patterson analysis, where six different atomic hypersurfaces are located on node and body-centre sites of the 6D lattice.
Journal ArticleDOI
Quasicrystalline low-friction coatings
Journal ArticleDOI
Mass spectrometric evidence for icosahedral structure in large rare gas clusters: Ar, Kr, Xe
TL;DR: In this paper, a simple structural model, assuming an icosahedral core decorated by the additional atoms, accounts for these anomalies reasonably well up to n=561, in striking agreement with the number of atoms required to build 3, 4, and 5 complete coordination shells, respectively.
Journal ArticleDOI
Incommensurate crystal structures
TL;DR: An overview of the crystallography of aperiodic crystals, in particular of incommensurately modulated structures and intergrowth compounds, is given in this paper, where the symmetry, the description of the structure and diffraction are described.
Journal ArticleDOI
Atomic structure of the icosahedral Al-Li-Cu quasicrystal
TL;DR: In this paper, a high-dimensional crystallography approach results in the phases to be reconstructed and atomic densities were calculated using a primitive hypercubic lattice with mid-edge and vertex Al/Cu atomic surfaces plus a Li bodycentre site.