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Upper cubic groups

The a-R12 allotrope consists of an approximately cubic closest packing arrangement of icosahedral B12 units bound to each other by covalent bonds. The parameters of the rhombohedral unit cell are a = 505.7 pm, a = 58.06° (60° for regular ccp). In space group Rim, the unit cell contains one B12 icosahedron. A layer of interlinked icosahedra perpendicular to the threefold symmetry axis is illustrated in Fig. 13.2.1. There are 12 neighboring icosahedra for each icosahedron six in the same layer, and three others in each of the upper and lower layers, as shown in Fig. 9.6.21(b). [Pg.461]

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See also in sourсe #XX -- [ Pg.301 ]



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Cubic groups

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