Diffuse Scattering from the Icosahedral Phase Alloys

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Abstract
We present neutron and x-ray measurements of the diffuse scattering from single-grain samples of the icosahedral phase of Al-Li-Cu. The x-ray measurements were analyzed to determine the integrated intensity of the diffuse scattering relative to the sharp diffraction peaks, as well as the length scale of the correlations which produce the diffuse scattering. The neutron data show that these correlations are static rather than dynamic in nature. In addition, we present a simple model based on the disordered packing of icosahedral clusters of atoms, which reproduces the unusual ringlike nature of this scattering. Quantitatively, this model overestimates the degree of disorder present in these alloys.