Hydrothermal synthesis of the tin analogue of penkvilksite-2O

resumo

The small-pore framework stannosilicate Na2SnSi4O11.2H(2)O (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 angstrom. 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 comer-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, Si-29, Sn-119, single and triple-quantum Na-23 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.

palavras-chave

INITIO STRUCTURE DETERMINATION; STRUCTURAL-CHARACTERIZATION; STANNOSILICATE; NMR; TITANOSILICATES; POLYTYPES; SILICATES; OXIDES

categoria

Mineralogy

autores

Lin, Z; Rocha, J

nossos autores

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