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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)
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