کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1506410 | 993793 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Crystal structures of Sr-diphylloaluminosilicates synthesized from LTA and FAU zeolites Crystal structures of Sr-diphylloaluminosilicates synthesized from LTA and FAU zeolites](/preview/png/1506410.png)
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 P3¯c1 (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 P3¯c1 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.
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Journal: Solid State Sciences - Volume 10, Issue 2, February 2008, Pages 154–159