S. H. J. Idziak and P. A. Heiney, Phil. Mag. 61, 819-838 (1990).
We present a detailed analysis of the peak shapes, positions, and intensities seen in electron diffraction and high-resolution powder x-ray diffraction patterns in the decagonal phase of rapidly quenched Al6-Pd. We use two different models to analyze the data. In one case the material is considered to be a decagonal quasicrystal, in which the diffraction pattern results from 5 incommensurate vectors in a plane and one vector normal to that plane. In the other case the 10-fold diffraction pattern is considered to arise from coherent twinning of microcrystals; additional multiple scattering is postulated to reconcile inconsistencies between the electron and x-ray diffraction patterns. Reasonable agreement is found with both models.
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