Geoscience Reference
In-Depth Information
Compound
Representative
Cell Parameter
(
˚
)
Rare Earth, Co.
No., Average
Bond Distance
(
˚
)
Tetrahedral Radical Form
Rare Earth
Polyhedra
Na
2
R
6
[Ge
2
O
7
]
2
[Ge
4
O
12
]
Na
2
Pr
6
[Ge
2
O
7
]
2
[Ge
4
O
12
]
Diorthogroup
1
4-membered ring
R
5
Pr
Nd
a
5
7.18
8 2.41
2.71
b
5
11.61
c
5
7.04
α
5
98.92
β
5
91.62
γ
5
102.50
K
4
Yb
2
[Ge
8
O
20
] (OH,
F)
2
P2
1
/mz
5
2
Yb 6 2.19
Tubular
Columns ribbons
a
5
12.105
b
5
11.896
c
5
8.576
γ
5
112.04
MRGe
2
O
6
NaScGe
2
O
6
Monoclinic
Metachain with a period of 2-
tetrahedra
Ribbons
M
5
K,Na
z
5
2
R
5
Sc
a
5
10.1
b
5
9.1
c
5
4.7
β
5
108
Na
5
RGe
4
O
12
Na
5
GdGe
4
O
12
R3c z
5
16
12-Membered rings
Discrete polyhedra
R
5
Gd
Lu, Y
a
5
22.781
c
5
12.994
MgLa
2
GeO
6
Pm3m
Isolated octahedra
a
5
3.90
