Abstract
The powder patterns of various icosahedral glass models for quasicrystalline alloys are compared with X-ray and neutron data on i-AlMnSi alloys. The patterns were found to be independent of the model size when the model diameter reached ∼450 Å. By constructing anisotropic packings, a transition is observed in the calculated patterns from a “typical” icosahedral glass pattern to what is clearly a disordered bcc pattern. Relaxed isotropic packings with varying local topologies are also examined which increase the model density and result in a more ordered powder pattern. While the undecorated icosahedral glass model reproduces many observed features, its detailed comparison requires further study.
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