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 3 ¯ c 1 (No. 165) and hexagonal space group P6 3/ 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 3 ¯ c 1 are refined to the agreement factors: R exp = 3.32, R p = 6.63, R wp = 9.27, R B = 3.70 for Sr-diphylloaluminosilicate LTA and R exp = 3.64, R p = 7.06, R wp = 10.1, R B = 3.76 for Sr-diphylloaluminosilicate FAU. Structural models described in the space group P6 3/ mcm are refined to the agreement factors: R exp = 3.32, R p = 6.50, R wp = 9.10, R B = 3.40 for Sr-diphylloaluminosilicate LTA and R exp = 3.64, R p = 6.92, R wp = 9.90, R B = 3.55 for Sr-diphylloaluminosilicate FAU. Vacancies in the positions occupied by the Sr 2+ ions are characteristic of the Sr-diphylloaluminosilicate FAU structure.
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