Geoscience Reference
In-Depth Information
Cell Parameter ( ˚ )
Compound
Representative
Rare Earth, Co.
No., Average Bond
Distance ( ˚ )
Tetrahedral
Radical Form
Rare Earth Polyhedra
NaR[SiO 4 ]
NaY[SiO 4 ]
Pbn2 1 z 5 4
Y
6
2.26
Orthotetrahedra
Discrete
R 5 Er Lu, Y
a 5 5.09
Polyhedra
b 5 10.96
c 5 6.35
NaR[SiO 4 ]
NaSm[SiO 4 ]
14/m z 5 8
Sm
8
2.51
Orthotetrahedra
Framework
R
Nd
Ho
a 5
11.89
5
c 5
5.45
NaR[SiO 4 ]
NaNd[SiO 4 ]
Pna2 1 z 5 12
Nd
8
2.45
Orthotetrahedra
Column
R 5 Ce Nd
a 5 20.00
b 5 9.28
c 5 5.45
KNd 9 [SiO 4 ] 6 O 2
P6 3 z 5 1
Nd
7
2.48
Orthotetrahedra
Framework
a 5 9.576
(K,Nd)
9
2.48
c 5 7.009
(K,Nd)
9
2.75
LiY[SiO 4 ]
P2 I /b z 5 4
Y
7
2.01
Orthotetrahedra
Layers from 6-membered
ring, seven-sided
framework
a 5 5.368
b 5 10.806
c 5 6.195
γ 5 113.40
Na 2 R[SiO 4 ]OH
Pnma z 5 4
La
8
2.59
Orthotetrahedra
Na 2 La[SiO 4 ]OH
a 5 9.72
R 5 La Pr
b 5 7.57
(Continued)
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