The atomic structure of rapidly quenched quasicrystals, Al₈₀{Mn}₂₀$, ${Al}₇₅Mn₂₀{Si}₅$, and ${Al}₇₅Mn₁₅{Cr}₅Si₅, was studied by pulsed neutron scattering. The pair distribution function was obtained by a direct Fourier transformation of the structure factor, and by assuming isomorphous substitution of Cr for Mn the differential distribution function (DDF) was determined. The addition of Si was found to increase the medium-range order significantly. The DDF from Mn atoms indicates the presence of a quasicrystalline substructure which is occupied both by Mn and Al atoms. The atomic structure of these solids, therefore, is significantly different from that of quasicrystalline Pd58.8{U}20.6Si20.6.
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Nanao et al. (1987) studied this question.
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