Figure 2
The Sm-centered template motifs containing the first atomic shell.
(a) Template motifs extracted from known Al-Sm crystalline compounds51: T1, a typical C.N. 16 Frank-Kasper polyhedron, is extracted from the Al2Sm phase; T2 is extracted from Al3Sm; T3 from γ-Al4Sm; T4 from β-Al4Sm and α-Al11Sm3; T5 is another Sm-centered motif in α-Al11Sm3. (b) Two motifs frequently appearing in new crystalline structures found by GA search. (c) Two additional hypothetical motifs: T8 is the building block for fcc structures; T9 is an icosahedron. Red ball represents for center Sm atom and blue for neighbor atom.
