Hydrothermal synthesis of the tin analogue of penkvilksite-2O

Authors: Lin, Zhi; Rocha, João

Source: European Journal of Mineralogy, Volume 17, Number 6, December 2005 , pp. 869-873(5)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

The small-pore framework stannosilicate Na₂SnSi₄O₁₁.2H₂O (Sn-AM-3), exhibiting the structure-type of the rare mineral penkvilksite-2O, has been synthesized via a seeded hydrothermal process. The estimated cell dimensions are: a = 16.52, b = 8.80, c = 7.48 Å. The Sn-AM-3 three-dimensional framework is made up of [Si₄O₁₁] silicate sheets interconnected by SnO₆ octahedra. The [Si₄O₁₁] silicate sheets may be described as a combination of the spiral chains formed by the corner-sharing SiO₄ tetrahedra. Sn-AM-3 is the first example of a synthetic microporous stannosilicate whose structure is built up from silicate sheets. All materials were studied by bulk chemical analysis, powder X-ray diffraction, scanning electron microscopy, ²⁹Si, ¹¹⁹Sn, single- and triple-quantum ²³Na magic-angle spinning NMR spectroscopy and thermogravimetry. Solid-state NMR is a particularly powerful technique to establish the presence of the 1M and 2O polytypes and accurately determine their relative abundances in mixed samples.

Keywords: SILICATES; STANNOSILICATES; PENKVILKSITE; SYNTHESIS; SOLID-STATE NMR

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0935-1221/2005/0017-0869

Publication date: 2005-12-01

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