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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.

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Crystal chemistry of silica-rich Barium silicates

III: Refinement of the crystal structures of the layer silicates Ba2[Si4O10] (I), (Sanbornite), and Ba2[Si4O10] (h)

K.-F. Hesse / F. Liebau
Published Online: 2010-07-28 | DOI: https://doi.org/10.1524/zkri.1980.0004

Abstract

The crystal structures of the two title compounds have been refined with three-dimensional Mo X-ray intensities. Results for both are given in the order a, b, c, β, Z, space group, number of independent reflections, R(unweighted), R(weighted):

  • Ba2[Si4O10](l): 7.688(1) Å, 4.629(1) Å, 13.523(1) Å, 90°, 2, Pmcn, 611, 0.041, 0.045.

  • Ba2[Si4O10](h): 23.195(2) Å, 4.658(1) Å, 13.613(1) Å, 97.57(1)°, 6, C2/c, 1579, 0.033, 0.034.

Both polymorphs contain chains with two [SiO4] tetrahedra in the repeat unit of approximately 4.6 Å (zweier single chains). These chains are linked via every second tetrahedron to zweier single layers parallel (001). The higher degree of corrugation of the layers in the low-temperature phase compared to those of the high-temperature phase is explained by the smaller effective radius of the barium ions at lower temperature. Barium ion coordination number is 9 in the low-temperature and both 9 and 8 + 2 in the high-temperature form respectively. The barium oxygen polyhedra share edges to form layers parallel (001).


Published Online: 2010-07-28

Published in Print: 1980-01-01


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials. Volume 153, Issue 1-2, Pages 33–41, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.1980.0004, July 2010

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