Abstract
The structure of an Al-Ni-Fe decagonal phase, which was found as a highly-ordered decagonal quasicrystal with periodicity of 0.4 nm in an Al 71.6 Ni 23.7 Fe 4.7 alloy, has been studied by atomic-scale observations of high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). It has been found that a large columnar cluster of atoms with a decagonal section of about 3.2 nm in diameter exists as a basic structural unit. A structural model of the cluster is proposed from HAADF-STEM images.
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