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Title: | Crystal structures of Sr-diphylloaluminosilicates synthesized from LTA and FAU zeolites | Authors: | Nedić Vasiljević, Bojana Kremenović, Aleksandar Dimitrijević, Radovan Dondur, Vera |
Keywords: | Crystal structure;Diphylloaluminosilicate;FAU zeolite;LTA zeolite | Issue Date: | 1-Feb-2008 | Journal: | Solid State Sciences | Abstract: | Crystal structures of stoichiometric and non-stoichiometric Sr-diphylloaluminosilicate phases are solved and refined using X-ray powder diffraction (XRPD) data by Rietveld method in trigonal space group P over(3, -) c 1 (No. 165) and hexagonal space group P63/mcm (No. 193), respectively. The stoichiometric phase is synthesized from the Sr-LTA zeolite, whereas the non-stoichiometric phase is prepared from the Sr-FAU zeolite by thermal treatment. Structural models described in the space group P over(3, -) c 1 are refined to the agreement factors: Rexp = 3.32, Rp = 6.63, Rwp = 9.27, RB = 3.70 for Sr-diphylloaluminosilicateLTA and Rexp = 3.64, Rp = 7.06, Rwp = 10.1, RB = 3.76 for Sr-diphylloaluminosilicateFAU. Structural models described in the space group P63/mcm are refined to the agreement factors: Rexp = 3.32, Rp = 6.50, Rwp = 9.10, RB = 3.40 for Sr-diphylloaluminosilicateLTA and Rexp = 3.64, Rp = 6.92, Rwp = 9.90, RB = 3.55 for Sr-diphylloaluminosilicateFAU. Vacancies in the positions occupied by the Sr2+ ions are characteristic of the Sr-diphylloaluminosilicateFAU structure. © 2007 Elsevier Masson SAS. All rights reserved. |
URI: | https://dspace.ffh.bg.ac.rs/handle/123456789/742 | ISSN: | 1293-2558 | DOI: | 10.1016/j.solidstatesciences.2007.08.019 |
Appears in Collections: | Journal Article |
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