Geoscience Reference
In-Depth Information
Compound
Representative
Cell Parameter
(
˚
)
Rare Earth, Co.
No., Average
Bond Distance
(
˚
)
Tetrahedral Radical Form
Rare Earth
Polyhedra
NaR[GeO
4
]
NaSm[GeO
4
]
Pbn2
1
z
5
4
Sm 6 2.36
Orthotetrahedra
Discrete polyhedra
R
5
Sm
Lu, Y
a
5
5.27
b
5
11.70
c
5
6.50
NaR[GeO
4
]
NaEu[GeO
4
]
14/mz
5
8
Orthotetrahedra
Framework
R
La
Nd
a
5
11.75
c
5
5.45
5
NaR
3
[GeO
4
]
2
(OH)
2
NaSm
3
[GeO
4
]
2
(OH)
2
Bb z
5
4
Sm 8 2.46
Orthotetrahedra
Discrete polyhedra
R
5
Nd
Gd
a
5
18.21
Sm 7 2.47
b
5
12.15
c
5
5.27
γ
5
131.88
NaHo
4
[GeO
4
]
2
O
2
(OH)
Pnma z
5
4
Ho 7 2.33
Orthotetrahedra
Framework
a
5
6.75
b
5
21.67
c
5
6.91
Na
2
R[GeO
4
]
Na
2
Pr[GeO
4
]
Pnma z
5
4
Pr
8 2.51
Orthotetrahedra
Framework
R
5
Pr
Gd
a
5
9.52
b
5
7.48
c
5
6.98
Na
2
Sc[GeO
4
](OH)
P2
1
ab z
5
8
Sc
6 1.99
2.18 Orthotetrahedra
Ribbon
a
5
12.34
b
5
13.78
c
5
5.53
