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Dynamical Diffraction and X-Ray Standing Waves from Atomic Planes Normal in a Twofold Symmetry Axis of the Quasicrystal A1PdMn

Published

Author(s)

Terrence J. Jach, Yanbao Zhang, R. Colella, M. De Boissieu, M. Boudard, A. I. Goldman, T Lograsso, D W. Delaney, S. Kycia

Abstract

We have observed dynamical diffraction in the [024024] and[046046] reflections of the icosahedral quasicrystal A1PdMn in the back-reflection geometry (θB = 90 ). The x-ray fluorescence from the Al and Pd atoms exhibits strong standing wave behavior, similar to that observed in crystalline materials. The data indicate a long-range order of each species of atoms, with the coherent positions attributable to distributions of the Al and Pd, which we compare to a centrosymmetric model. We observe deviations from the model which imply small departures from inversion symmetry along the twofold symmetry axis and from the expected coherent fractions for Al.
Citation
Physical Review Letters
Volume
82

Keywords

Diffraction, dynamical diffraction, icosohedral, quasicrystal, standing waves, x-ray, x-ray diffraction, x-ray standing waves

Citation

Jach, T. , Zhang, Y. , Colella, R. , De, M. , Boudard, M. , Goldman, A. , Lograsso, T. , Delaney, D. and Kycia, S. (1999), Dynamical Diffraction and X-Ray Standing Waves from Atomic Planes Normal in a Twofold Symmetry Axis of the Quasicrystal A1PdMn, Physical Review Letters (Accessed March 3, 2024)
Created April 1, 1999, Updated February 19, 2017