Geoscience Reference
In-Depth Information
Framework [Si
2
O
5
] was found in the structure of K
2
Ce[Si
6
O
15
](
Figure 7.15
)
[73]
.
Thus, a wide variety of Si
O anionic motif forming unique layers, ribbons,
chains, rings, and framework is characteristic of only rare earth silicates. Such com-
plex and highly fine structures have been observed in synthetic rare earth silicates.
a
Figure 7.13 Layers from 4-, 6-, and 8-membered rings, [Si
2
O
5
], in the structure of K
3
Nd
[Si
6
O
15
]
[71]
.
Figure 7.14 Triple columnar [Si
3
O
7
] in the structure of NaR[Si
6
O
14
]
[72]
.
