S. Idziak, P. A. Heiney and P. A. Bancel, Proc. Int. Workshop on Quasicrystals (Beijing), Mat. Sci. Forum 22-24, 353-368 (1987).
We have used electron and x-ray diffraction to study the structure of the Al-Pd decagonal pahse. Many features of the electron diffraction patterns can be reproduced by a quasiperiodic model incorporating five vectors generating a unique decagonal plane plus a single vector in the periodic direction. Both the diffuse scattering and peak shapes seen in the electron diffraction patterns, and the wide variety of peak widths in high resolution x-ray powder diffraction scans, suggest that disorder in the decagonal phase is primarily of phason character. Systematic cancellations in the diffraction patterns indicate the existence of a set of glide planes.