Crystal structure and thermal behavior of a new borosilicate with the CAS framework type

Krzhizhanovskaya, M. G., Bubnova, R. S., Depmeier, W., Filatov, S. K. and Ugolkov, V. L. (2008) Crystal structure and thermal behavior of a new borosilicate with the CAS framework type Microporous and Mesoporous Materials, 116 (1-3). pp. 569-574. DOI 10.1016/j.micromeso.2008.05.041.

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The crystal structure of the new microporous framework borosilicate vertical bar CS(4)vertical bar[B(4)Si(20)O(48)]-CAS has been studied using X-ray diffraction data on powders prepared by solid state reaction as well as by glass crystallization. It is isostructural with vertical bar Cs(4)vertical bar[Al(4)Si(20)O(48)]-CAS and belongs to the zeolite framework type CAS. Non-random distribution of the Si and B atoms over the tetrahedral positions has been revealed. The behavior Of vertical bar CS(4)vertical bar[B(4)Si(20)O(48)]-CAS on heating was studied using high-temperature X-ray diffraction HTXRD, differential thermal analysis (DTA) and annealing series. According to HTXRD data the thermal deformation of vertical bar CS(4)vertical bar[B(4)Si(20)O(48)]-CAS has anisotropic character with the maximum expansion along the infinite channels where the Cs atoms are located. The DTA and heat treatment studies showed that during the solid state reaction the first phase to crystallize at about 800 degrees C is the boropollucite CsBSi(2)O(6), which beyond 900 degrees C transforms into vertical bar CS(4)vertical bar[B(4)Si(20)O(48)]-CAS . Around 1100 degrees C a final decomposition occurs according to the reaction vertical bar CS(4)vertical bar[B(4)Si(20)O(48)]-CAS -> 20SiO(2) + 4CsBO(2)up arrow. (C) 2008 Elsevier Inc. All rights reserved.

Document Type: Article
Keywords: X-Ray powder diffraction Rietveld structure refinement Thermal deformation Borosilicate Zeolite powder diffraction data solid-solutions crystallization glasses csalsi5o12 zeolite system
Research affiliation: Kiel University
DOI etc.: 10.1016/j.micromeso.2008.05.041
ISSN: 1387-1811
Date Deposited: 12 Jan 2012 06:01
Last Modified: 08 Oct 2012 10:15

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