1994
DOI: 10.1107/s0108768193012625
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Structure of SAPO-31 refined from single-crystal diffraction data: substitution of P by Si established by diffraction methods

Abstract: powder diffraction data for A1PO4-31 is confirmed with much higher precision. The Si atoms in SAPO-31 replace statistically part of the P atoms in the framework. This type of substitution has thus been established by X-ray diffraction methods for the first time in a microporous silicoaluminophosphate.

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Cited by 30 publications
(10 citation statements)
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“…Powder X-ray diffraction measurements on calcined AlPO 4 -31 revealed a rhombohedral symmetry (hexagonal setting, a ¼ b ¼ 20:827 (1) A A, c ¼ 5:003(1) A A, and space group R-3) [1]. The rhombohedral symmetry was also determined for the as-synthesized SAPO-31 [2]. Recently [3], a powder X-ray diffraction pattern, without structure refinement, of as-synthesized AlPO 4 After the incorporation of a small amount of metal (Zn, Mg) into the AlPO 4 -31 framework, the symmetry changed to rhombohedral [3].…”
Section: Introductionmentioning
confidence: 80%
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“…Powder X-ray diffraction measurements on calcined AlPO 4 -31 revealed a rhombohedral symmetry (hexagonal setting, a ¼ b ¼ 20:827 (1) A A, c ¼ 5:003(1) A A, and space group R-3) [1]. The rhombohedral symmetry was also determined for the as-synthesized SAPO-31 [2]. Recently [3], a powder X-ray diffraction pattern, without structure refinement, of as-synthesized AlPO 4 After the incorporation of a small amount of metal (Zn, Mg) into the AlPO 4 -31 framework, the symmetry changed to rhombohedral [3].…”
Section: Introductionmentioning
confidence: 80%
“…2 A A shows that manganese has four oxygen neighbors at 2.02 A A in the as-synthesized sample, indicating the incorporation of manganese(II) into tetrahedral framework sites. After calcination, the local environment of manganese atoms is significantly changed.…”
Section: Exafs and Xanes Studies-local Symmetry Of Cobalt And Manganesementioning
confidence: 93%
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“…For the SAPO systems, the optimised AlPO models were taken as starting point. As it has been established that Si substitution occurs at phosphorus sites of the AlPO matrix, 48,49 isolated phosphorus atoms were replaced by silicon in an ordered fashion, and a hydrogen atom was placed at one of the oxygen atoms surrounding the Si site. This led to a reduction of the symmetry, which is summarised for each system in the Results section (a more detailed description is given in the ESI †).…”
Section: Introductionmentioning
confidence: 99%