Small-pore framework zirconium and hafnium silicates with the structure of mineral tumchaite
authors Lin, Z; Rocha, J
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords microporous; silicates; zirconium silicates; hafnium silicates; synthesis
keywords MICROPOROUS TITANOSILICATE; PENKVILKSITE
abstract Small-pore framework sodium silicates (AV-14) Na2MSi4O11 (.) 2H(2)O (M = Zr and Hf) possessing the structure of the rare mineral tumchaite have been prepared via hydrothermal synthesis. The AV-14 framework consists of corner-sharing MO6 (M = Zr, Hf) octahedra and SiO4 tetrahedra. The [Si4O11] Silicate sheets may be described as a combination of the spiral chains formed from the corner-sharing SiO4 tetrahedra. These sheets are connected by MO6 octahedra, resulting in a three dimensional framework. AV-14 materials are the first examples of synthetic microporous zirconium and hafnium silicates whose structures are built up from silicate sheets. Hf- and Zr-AV-14 materials and the parakeldyshite-type phase, which forms at 1100 degreesC from the decomposition of Zr-AV-14, have been studied by bulk chemical analysis, powder X-ray diffraction, scanning electron microscopy, Na-23 and Si-29 magic-angle spinning NMR spectroscopy and thermogravimetry. (C) 2004 Elsevier Inc. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 1387-1811
year published 2004
volume 76
issue 1-3
beginning page 99
ending page 104
digital object identifier (doi) 10.1016/j.micromeso.2004.07.037
web of science category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000225255100013
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