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https://dspace.ffh.bg.ac.rs/handle/123456789/837| Title: | Routes of synthesis of nepheline-type polymorphs: An influence of Na-LTA bulk composition on its thermal transformations | Authors: | Radulović, Aleksandra Dondur, Vera Vulić, Predrag Miladinović, Zoran Ćirić-Marjanović, Gordana Dimitrijević, Radovan |
Keywords: | A. Ceramics;C. Raman spectroscopy;C. X-ray diffraction;D. Nuclear magnetic resonance (NMR);D. Phase transitions | Issue Date: | 1-Sep-2013 | Journal: | Journal of Physics and Chemistry of Solids | Abstract: | In this work we investigated the conditions under which pure basic hexagonal nepheline phase is formed by the zeolite Na-LTA thermal transformation route. The influence of small variations in Na-LTA bulk stoichiometry on the rate and course of the thermal transformation process was examined. The starting materials were three Na-LTA samples with different Na2O: Al 2O3: SiO2 ratios: 0.99Na2O: 1.00Al2O3: 2.00 SiO2, 1.05Na2O: 1.06Al2O3: 2.00SiO2 and 1.05Na2O: 1.00Al2O3: 2.05SiO2. Upon heat treatment, the zeolite samples showed different conversion routes. At temperatures above 950 C all three Na-LTA samples transformed into nepheline-type polymorphs. While the Na-LTA sample with the composition close to ideal stoichiometry gave pure basic hexagonal nepheline, the Na-LTA samples containing sodium, aluminum and silica excess formed mixtures of basic hexagonal nepheline and monoclinic trinepheline. The synthesized nepheline-type polymorphs were investigated by X-ray powder diffraction, Raman and NMR spectroscopy. © 2013 Elsevier Ltd. |
URI: | https://dspace.ffh.bg.ac.rs/handle/123456789/837 | ISSN: | 0022-3697 | DOI: | 10.1016/j.jpcs.2013.03.019 |
| Appears in Collections: | Journal Article |
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