Geoscience Reference
In-Depth Information
Cell Parameter (
˚
)
Compound
Representative
Rare Earth, Co.
No., Average
Bond Distance (
˚
)
Tetrahedral Radical Form
Rare Earth Polyhedra
b
5
24.40
R
2
Si
2
O
7
Yb
2
Si
2
O
7
C2/mz
5
2
Yb
6
2.24
Diortho-
Ribbon
R
5
Ho
Lu, Sc
a
5
6.802
b
5
8.875
c
5
4.703
β
5
102.12
R
2
Si
2
O
7
Er
2
Si
2
O
7
P2
1
/bz
5
2
Er
6
2.26
Diortho-
Layer
R
5
Ho
Er
a
5
4.683
b
5
5.556
c
5
10.79
γ
5
96
R
2
Si
2
O
7
Gd
2
Si
2
O
7
Pna21 z
5
4
Gd
7
2.40
Diortho-
Framework
R
5
Eu
Ho
a
5
13.87
b
5
5.073
c
5
8.33
R
2
Si
2
O
7
Eu
2
Si
2
O
7
P
1
P
I
z
5
4
Diortho-
R
5
Sm
Eu
a
5
8.517
b
5
12.848
c
5
5.385
α
5
91.65
β
5
92.24
γ
5
90.44
R
2
Si
2
O
7
Nd
2
Si
2
O
7
P2
I
2
I
2
I
z
5
4
Nd
8
2.53
Diortho-
Framework
R
5
La
Sm
a
5
5.394
(Continued)