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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|
|Keywords:||AlPdMn,dynamical diffraction,quasicrystal,x-ray standing wave|
|Research Areas:||Materials Science|