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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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Title
K4 (Nb O)2 (Si8 O21): synthesis, structure and properties.
Authors
Rastsvetaeva, R.K.;Bolotina, N.B.;Pushcharovskii, D.Yu.;Stefanovich, S.Yu.;Nadezhina, T.N.;Dimitrova, O.V.
Reference
Kristallografiya (1994)
39
, 100-100
Link
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Compound
K4 Nb2 O23 Si8
- Tetrapotassium bis(oxoniobium) octasilicate - basic structure
[
A2B4C8X23
] [
aP37
] [
i18 b
] [
]
Cell
6.784(4), 10.950(6), 7.737(4), 76.42(4), 72.10(5), 89.81(5)
P1- (2)
V=530.16
Remarks
R=0.030000 : M
Superstructure has 5-fold a, cp. 39846
R for first-order satellites: 0.065, for second order satellite
Atom (site) Oxid.
x, y, z, B, Occupancy
Si1
(2i)
4
Si2
(2i)
4
Si3
(2i)
4
Si4
(2i)
4
Nb1
(2i)
5
K1
(2i)
1
K2
(2i)
1
O1
(2i)
-2
O2
(2i)
-2
O3
(2i)
-2
O4
(2i)
-2
O5
(2i)
-2
O6
(2i)
-2
O7
(2i)
-2
O8
(2i)
-2
O9
(2i)
-2
O10
(1b)
-2
O11
(2i)
-2
O12
(2i)
-2
0.96
0.20
0.10
0.61
1
0.17
0.37
0.30
0.62
1
0.50
0.21
0.18
0.62
1
0.16
0.00
0.30
0.58
1
0.78
0.31
0.72
0.94
1
0.27
0.48
0.76
2.08
1
0.32
0.14
0.70
2.23
1
0.36
0.08
0.29
1.2
1
0.40
0.32
0.27
1.16
1
0.71
0.18
0.23
1.22
1
0.54
0.24
0.96
1.07
1
0.05
0.34
0.52
1.33
1
-.00
0.25
0.89
1.13
1
0.61
0.36
0.59
1.38
1
0.06
0.07
0.15
1.22
1
0.77
0.13
0.70
1.29
1
0
0
0.5
1.44
1
0.06
0.31
0.18
1.42
1
0.80
0.47
0.79
1.32
1
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