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Please use this identifier to cite or link to this item: https://dspace.ffh.bg.ac.rs/handle/123456789/1618
Title: Thermally induced rings formation in aluminosilicate structures
Authors: Marković, S.
Dondur, Vera
Dimitrijević, R.
Macura, S.
Keywords: Pure sodium nepheline;Structural transitions;Zeolite NaP
Issue Date: 1-Jan-2006
Journal: Journal of Thermal Analysis and Calorimetry
Abstract: 
In the present study, we performed an investigation of phase transformation of zeolite Na-GIS in temperature interval from room temperature up to 1300°C. The collapse of S4R and S8R (secondary building units in zeolite Na-GIS) and the forming of pure sodium nepheline phase, consists of S6R, was examined. During the thermal transformation of Na-GIS zeolite symmetry of rings was changed and their deformation increases. The irregularity of rings causes the appearance of defect modes in the IR spectra of amorphous precursors. Investigated phases were characterized by XRPD, IR, NMR and DSC methods. A semiempirical method AM1 was used for calculation of vibrational spectrum of nepheline. © 2006 Akadémiai Kiadó.
URI: https://dspace.ffh.bg.ac.rs/handle/123456789/1618
ISSN: 1388-6150
DOI: 10.1007/s10973-005-7161-2
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University of Belgrade
Faculty of Physical Chemistry
Studentski trg 12-16
11158 Belgrade 118
PAC 105305
SERBIA
University of Belgrade Faculty of Physical Chemistry