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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=77070	Help
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 XRef SCOPUS Google
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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