Geoscience Reference
In-Depth Information
Compound
Representative
Cell Parameter ( ˚ )
Rare Earth, Co.
No., Average
Bond Distance ( ˚ )
Tetrahedral Radical Form
Rare Earth Polyhedra
R 2 [SiO 4 ]O
Gd 2 [SiO 4 ]O
P2 1 /cz 5 4
Gd 1
7
2.39
Orthotetrahedra
Framework
R 5 La Tb
a 5 9.12
Gd 2
9
2.49
b 5 7.06
c 5 6.73
β 5 107.58
R 2 [SiO 4 ]O
Yb 2 [SiO 4 ]O
B2/bz 5 8
Yb 1
7
2.33
Orthotetrahedra
Framework
R 5 Tb Lu, Y
a 5 14.28
b 5 10.28
Yb 2
6
2.33
c 5 6.653
γ 5 122.2
R 4 . 67 [SiO 4 ] 3 O d 4.67 [SiO 4 ] 3 O
P6 3 /mz 5 2
Gd 1
7
2.41
Orthotetrahedra
Framework
R 5 La Lu
a 5 9.431
Gd 2
9
2.53
b 5 9.873
α -Eu 2 1 2 [SiO 4 ]
P2 1 /cz 5 4
Eu 1
8
2.62
Orthotetrahedra
Framework
a 5 5.661
b 5 7.101
Eu 2
10
2.86
c 5 11.518
β 5 122.01
β -Eu 2 1 2 [SiO 4 ]
Pnma z 5 4
Eu 1
10
2.86
Orthotetrahedra
Framework
a 5 7.137
b 5 5.665
Eu 2
7
2.57
c 5
9.767
R 2 Si 2 O 7
Sm 2 Si 2 O 7
P4 1 z 5
8
Sm 1
7
2.42
Diortho-
Framework
R 5 La Eu
a 5 6.695
Sm 2
9
2.56
(Continued)
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