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In-Depth Information
Compound
Representative
Cell Parameter ( ˚ )
Rare Earth, Co.
No., Average Bond
Distance ( ˚ )
Tetrahedral
Radical Form
Rare Earth Polyhedra
c 5 6.81
I
4{NaYSiO 4 }NaF
l 4 z 5 8
Orthotetrahedra
Framework
a 5 11.579
c 5 5.396
Na 3 R[Si 2 O 7 ]
Na 3 Sc[Si 2 O 7 ]
Pbnm z 5 4
Sc
6
2.10
Diorthohedra
discrete poly
R 5 Er Lu, Y, Sc
a 5 5.354
b 5 9.347
c 5 13.089
Na 6 YSc[Si 2 O 7 ] 2
P6 3 z 5 4
Y
6
2.62
Diorthohedra
Discrete poly
a 5 10.726
6
2.71
b 5 13.491
K 3 Eu[Si 2 O 7 ]
P6c2 z 5 6
Eu
6
2.31
Diortho-
Discrete polyhedra
a 5 9.956
c 5 14.455
K 3 Y[Si 3 O 8 (OH) 2 ]
Pmnb z 5 4
Y
6
2.23
Triortho-
Discrete polyhedra
a 5 13.536
b 5 13.17
c 5 5.867
Na 4 Sc 2 [Si 4 O 13 ]
Pna2 1 z 5 4
Sc
6
2.11
Tetra-
Polyhedra
a 5 14.442
b 5 5.288
c
14.219
5
K 4 Sc 2 [Si 4 O 12 ]
Pbam z 5
8
Sc
6
2.09
4-Membered
Chain
(OH) 2
a 5 12.725
2 2.16
ring
(Continued)
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