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Figure 6
Main cluster of structures in space group [F\bar{4}3m]. The two variants of inner cluster shells are a (tetrahedrally distorted) rhombic dodecahedron and a Friauf polyhedron. The second cluster shell is in all cases a tetrahedrally truncated rhombic dodecahedron (truncated at all four- and half of the three-vertices) with atoms not only occupying corners, but also centering all pentagonal faces. The different third-shell clusters are designated with respect to their number of vertices V, types of faces F and the structural subtypes in which they occur. The packing of three-shell clusters in the unit cell is shown using the example of the F7640 polyhedron – it is an f.c.c. packing.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 67| Part 4| August 2011| Pages 269-292
https://doi.org/10.1107/S0108768111025390
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