Abstract
Many distinct phases of aluminum cobalt alloys occur in a narrow composition range near Al 3Co. We compare the distribution functions of these structures with pair potentials calculated for this binary alloy. Both the AlCo and the CoCo distributions display strong modulations out to distances of beyond 10 Å, while the AlAl distributions approach a constant beyond a few Angstroms. Radial distribution functions peaks generally fall in the vicinity of pair potential minima. We show how energetically favorable interatomic spacings relate to local atomic arrangements in a cluster known as a pentagonal bipyramid. Filling space with this cluster suggests a possible tiling model for the decagonal phase.
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