<div class="csl-bib-body">
<div class="csl-entry">Ketter, M., & Weil, M. (2022). The layer silicate Cs₂SnIVSi₆O₁₅. <i>Acta Crystallographica Section E: Structure Reports Online</i>, <i>78</i>, 111–113. https://doi.org/10.1107/S2056989021013554</div>
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dc.identifier.issn
1600-5368
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/142588
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dc.description.abstract
Single crystals of Cs₂SnSi₆O₁₅, dicaesium tin(IV) hexa-silicate, were serendipitously obtained from a CsCl/NaCl flux at 923 K, starting from mixtures of CaO, SnO and TeO₂ in a closed silica ampoule. The crystal structure of Cs₂SnSi₆O₁₅ is constructed from {Si₆O₁₅}6- layers extending parallel to (101), and CsI cations with a coordination number of eleven as well as isolated [SnO₆] octa-hedra situated between the silicate layers. Each of the nine different SiO4 tetra-hedra in the silicate layer has a connectedness of Q3 (three bridging and one terminal O atom), which leads to the formation of five- and eight-membered rings. The same type of silicate layer is found in the crystal structure of the mineral zeravshanite. Comparison with other silicates of the type Cs₂MIVSi₆O₁₅ (M IV = Ti, Zr, Th, U) revealed a klassengleiche group-subgroup relationship of index 2 between Cs₂ZrSi₆O₁₅ (Z = 6, space group C2/m) and Cs₂SnSi₆O₁₅ (Z = 12, space group I2/c).