We present high-resolution x-ray diffraction mesaurements of the recently discovered face-centered icosahedral phase of Al65Cu20Ru15. Analysis of the diffraction-peak profiles shows that this alloy is better ordered than the simple-icosahedral alloys previously studied. In particular, the peak broadening is well accounted for by simple lattice strain, with no measurable dependence of the peak widths on phason momentum. This implies a significantly diminished role for phason disorder in this system relative to the simple-icosahedral alloys.
ASJC Scopus subject areas
- Physics and Astronomy(all)