K0.72Na1.71Ca5.79Si6O19 – the first oligosilicate based on [Si6O19]-hexamers and its stability compared to cyclo­silicates

Kahlenberg, V.; Krüger, H.; Garber, S.; Krüger, B.; Libowitzky, E.; Kröll, S.; Hofer, T.S.; Gallmetzer, J.M.; Purtscher, F.R.S.

doi:10.1107/S2052520624007352

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 3
Side views of a single [Si₆O₁₉] oligoanion. (a) The six Si atoms occupy the corners of a distorted cube, with the remaining two corners occupied by M1 cations. (b) A single [Si₆O₁₉]-cluster has point group symmetry 2 (or C₂). (c) The corresponding distorted cube in combeite, ideally Na₄Ca₄Si₆O₁₈, contains a cyclic [Si₆O₁₈] ring. The oxygen and silicon atoms are shown in red and blue, respectively. M1 corresponds to a mixed site occupied by calcium (light blue) and sodium (yellow) cations. The sizes of the two-coloured segments refer to the percentages determined from the site-occupancy refinements.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 80| Part 5| October 2024| Pages 474-487

https://doi.org/10.1107/S2052520624007352

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