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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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CC=62356
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Title
Crystal structure of keivyite Yb2 (Si2 O7).
Authors
Yakubovich, O.V.;Simonov, M.A.;Voloshin, A.V.;Pakhomovskii, Ya.A.
Reference
IC&volume=291&fpage=863&details=yes target=icsd_help>Doklady Akademii Nauk SSSR (1986)
291
, 863-867
Link
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Compound
O7 Si2 Yb2
-
[Keivyite (Yb)]
Diytterbium disilicate
[
A2B2X7
] [
mS22
] [
j i2 g d
] [
]
Cell
4.715(1), 8.870(3), 6.805(3), 90., 102.01(3), 90.
A12/M1 (12)
V=278.37
Remarks
R=0.040400 : P =37-458 : M =Keivyite (Yb) :
Atom (site) Oxid.
x, y, z, B, Occupancy
Yb1
(4g)
3
Si1
(4i)
4
O1
(2d)
-2
O2
(4i)
-2
O3
(8j)
-2
0
0.80
0.5
0
1
0.41
0.5
0.71
0
1
0.5
0.5
0.5
0
1
0.71
0.5
0.88
0
1
0.22
0.65
0.73
0
1
Atom (site) Oxid.
B11, B22, B33, B12, B13, B23
Yb1
(4g)
3
Si1
(4i)
4
O1
(2d)
-2
O2
(4i)
-2
O3
(8j)
-2
0.64
0.61
0.61
0
0.13
0
0.67
0.73
0.9(
0
0.38
0
1.6(
2.1(
0.6(
0
0.3(
0
1.0(
0.7(
1.2(
0
0.4(
0
1.3(
0.8(
1.4(
0.3(
0.6(
0.1(
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