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Publication Citation: Quasicrystal Element Correlations From X-Ray Standing Waves

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Author(s): Terrence J. Jach;
Title: Quasicrystal Element Correlations From X-Ray Standing Waves
Published: January 01, 2001
Abstract: X-ray standing waves associated with dynamical diffraction in perfect crystals are also present during diffraction in high-quality quasicrystals. The fluorescence observed from quasicrystals while scanning the rocking curve of a particular Bragg reflection shows an identical form to that observed from periodic planes in a perfect crystal. In this case, however, the coherent fraction is the value of a correlation function: the Fourier component of a given elemental distribution at the wavevector associated with the Bragg peak. We show, using a model for Al-Pd-Mn, how the observed value for the coherent position at a given reflection is a sensitive indicator of the centrosymmetry of the distribution, and the observed value for the coherent fraction is a test of the elemental distribution predicted from the model.
Citation: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
Volume: 294-296
Keywords: AlPdMn;dynamical diffraction;quasicrystal;x-ray standing wave
Research Areas: Materials Science