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Disordered quasicrystals: diffuse scattering in decagonal Al–Ni–Fe
Author(s) -
Weidner E.,
Frey F.,
Lei J.L.,
Pedersen B.,
Paulmann C.,
Morgenroth W.
Publication year - 2004
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889804017820
Subject(s) - quasicrystal , scattering , quasiperiodic function , synchrotron radiation , condensed matter physics , anisotropy , synchrotron , phonon , materials science , chemistry , molecular physics , crystallography , physics , optics
High‐resolution synchrotron data of near‐Bragg diffuse scattering from decagonal Al 71.5 Ni 23.5 Fe 5 quasicrystals were recorded. A dominant phasonic origin is ruled out because of the absence of a significant G ⊥ dependence. An analysis solely in the frame of thermal diffuse scattering (TDS) theory (phonon scattering) showed a good match between experimental and calculated data in the quasiperiodic layers, but with an improbable ratio of elastic constants, c 66 / c 11 = 4.0. In situ high‐temperature measurements up to 1000 K revealed an increase of the intensity distribution perpendicular to the scattering vector G . Huang diffuse scattering (HDS) arising from quenched local defects has a general appearance that qualitatively reproduces the observed symmetry and anisotropy. An interpretation based on both TDS and HDS contributions is given.