Weidner, Eveline; Frey, Friedrich; Lei, J.-L.; Pedersen, Bjoern; Paulmann, C.; Morgenroth, W.
Disordered quasicrystals: Diffuse scattering in decagonal Al-Ni-Fe.
In: Journal of Applied Crystallography, Vol. 37, Nr. 5: S. 802-807
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High-resolution synchrotron data of near-Bragg diffuse scattering from decagonal Al 71.5Ni 23.5Fe 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.