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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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TitleK4 (Nb O)2 (Si8 O21): synthesis, structure and properties.
AuthorsRastsvetaeva, R.K.;Bolotina, N.B.;Pushcharovskii, D.Yu.;Stefanovich, S.Yu.;Nadezhina, T.N.;Dimitrova, O.V.
ReferenceKristallografiya (1994) 39, 100-100
Link XRef SCOPUS Google
CompoundK4 Nb2 O23 Si8 - Tetrapotassium bis(oxoniobium) octasilicate - basic structure [A2B4C8X23] [aP37] [i18 b] []
Cell6.784(4), 10.950(6), 7.737(4), 76.42(4), 72.10(5), 89.81(5)
P1- (2) V=530.16
RemarksR=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
0.960.200.100.611
0.170.370.300.621
0.500.210.180.621
0.160.000.300.581
0.780.310.720.941
0.270.480.762.081
0.320.140.702.231
0.360.080.291.21
0.400.320.271.161
0.710.180.231.221
0.540.240.961.071
0.050.340.521.331
-.000.250.891.131
0.610.360.591.381
0.060.070.151.221
0.770.130.701.291
000.51.441
0.060.310.181.421
0.800.470.791.321

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