Synthesis and characterisation of a stannosilicate with the structure of penkvilksite-1M

resumo

The hydrothermal synthesis of the small-pore framework sodium stannosilicate Na2SnSi4O11 (.) 2H(2)O (Sn-AV-14) possessing the structure of the rare titanosilicate mineral penkvilksite-1M has been reported. The synthesis of this material has been optimised and shown to be very sensitive to the composition of the precursor gel, particularly the Si and water contents. Seeding is required to obtain this phase. The framework of Sn-AV-14 consists Of [Si4O11] silicate sheets (arising from the combination of spiral chains formed by corner-sharing SiO4 tetrahedra) interconnected by SnO6 octahedra. Narrow six-ring channels run along [010] and [001], housing Na+ and water molecules. Sn-AV-14 materials have been studied by bulk chemical analysis, powder X-ray diffraction, scanning electron microscopy, Na-23, Si-29 and Sn-119 magic-angle spinning NMR, Fourier transformed infrared spectroscopy and thermogravimetry. (c) 2006 Elsevier Inc. All rights reserved.

palavras-chave

INITIO STRUCTURE DETERMINATION; FRAMEWORK STANNOSILICATE; HYDROTHERMAL SYNTHESIS; SILICATES; TITANOSILICATES; TUMCHAITE; POLYTYPES; TIN

categoria

Chemistry; Science & Technology - Other Topics; Materials Science

autores

Lin, Z; Rocha, J

nossos autores

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