Geoscience Reference
In-Depth Information
YO
6
(a)
a
SiO
4
b
Na(2)
1/2 occupancy
c
Na(1)
(b)
Na
Ow
SiO
4
NdO
7
2.553(10)
(c)
O(3)
O(6)
3.132(9)
3.106(9)
3.543(10)
O(9)
O(2)
O(9)
O(2)
3.039(7)
3.693(11)
3.166(8)
3.107(8)
c
b
O(10)
a
Figure 7.17 Structures of (a) Na
3
YSi
6
O
15
as viewed along c-axis
[75]
, (b)
Na
3
NdSi
6
O
15
2H
2
O viewed along a, and (c) isolated NdO
7
polyhedron viewed along “a,”
the figure also gives oxygen
oxygen distances (
˚
)
[70]
.
