Abstract
In order to investigate the sites occupied by ruthenium atoms in the Al 76Mn 14Ru 7Si 3 and Al 68Mn 20Ru 8Si 4 icosahedral alloys, the differential structure factors (DSF) and the differential pair distribution functions (DPDF) concerning ruthenium were obtained by the anomalous X-ray scattering technique with synchrotron radiation. On the assumption that ruthenium atoms occupy aluminum or manganese sites in the atomic structure model (Mackay-type; Quasiperiodic Configuration of Icosahedral Clusters (QCIC) model) of the AlMn icosahedral phase, it is concluded that the ruthenium atoms are preferentially substituted at manganese sites which almost correspond to the vertices of the three-dimensional Penrose tiling (3D-PT) in i-Al 76 Mn 14 Ru 7 Si i3. In the case of i-Al 68 Mn 20 Ru 8 Si 4, ruthenium atoms are substituted for two kinds of atomic sites, one of which is the manganese site and the other is that of aluminum atoms at the innermost shell of Mackay icosahedra.
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