Crystal chemistry of silica-rich Barium silicates : I: Refinement of the crystal structures of Ba[SiO], Ba[SiO] and Ba[SiO], silicates with triple, quadruple and quintuple chains
✍ Scribed by Hesse, K.-F.; Liebau, F.
- Book ID
- 115492357
- Publisher
- Oldenbourg Wissenschaftsverlag
- Year
- 1980
- Tongue
- English
- Weight
- 995 KB
- Volume
- 153
- Category
- Article
- ISSN
- 2194-4946
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✦ Synopsis
Abstract
The crystal structures of the three synthetic title compounds have been refined with three-dimensional MoKα X-ray intensities. For each compound results are given in the order a, b, c, β, Z, space group, number of independent reflections, R (unweighted), R (weighted):
Ba4[Si6O16]: 12.477(2) Å, 4.685(1) Å, 13.944(3) Å, 93.54(2)°, 2, P21/c, 1249, 0.051, 0.046.
Ba5[Si8O21]: 32.675(7) Å, 4.695(1) Å, 13.894(3) Å, 98.10(2)°, 4, C2/c, 915, 0.053, 0.044.
Ba6[Si10O26]: 20.196(4) Å, 4.707(1) Å, 13.842(3) Å, 98.61(2)°, 2, P21/c, 1529, 0.058, 0.048.
In the three silicates corner-sharing [SiO4] tetrahedra form chains with two tetrahedra in the repeat unit parallel [010] (zweier single chains). In Ba4[Si6O16] three such single chains are linked into a zweier triple chain, in Ba5[Si8O21] four chains make a zweier quadruple chain and in Ba6[Si10O26] five chains make a zweier quintuple chain. Each barium ion is coordinated by eight oxygen atoms forming distorted square antiprisms.