Chemistry Reference
In-Depth Information
Fig. 8 The polyhedral
cavities observed in NON-
type clathrasils. (a)[4
1
5
8
]
nonahedron, (b)[5
4
6
4
]
octahedron and (c)[5
8
6
12
] 20-
hedron. Oxygen atoms are
placed near by the midpoints
of the lines connecting
neighbouring Si atoms
Fig. 9 Host framework of SGT-type clathrates. In this structure, the [4
3
5
6
] nonahedra share square
faces giving rise to a polyhedron distribution similar to that in the structure of SrSi
2
at high
pressure
