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

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Author(s): Terrence J. Jach; Yanbao Zhang; R. Colella; M. De Boissieu; M. Boudard; A. I. Goldman; T Lograsso; D W. Delaney; S. Kycia;
Title: Dynamical Diffraction and X-Ray Standing Waves from Atomic Planes Normal in a Twofold Symmetry Axis of the Quasicrystal A1PdMn
Published: April 01, 1999
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
Pages: pp. 2904 - 2907
Keywords: Diffraction;dynamical diffraction;icosohedral;quasicrystal;standing waves;x-ray;x-ray diffraction;x-ray standing waves
Research Areas: Spectroscopy