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SU-57 – An aluminosilicogermanate with a DFT topology and variable compositions
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
Vise andre og tillknytning
2009 (engelsk)Inngår i: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 117, nr 1-2, s. 285-291Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

An aluminosilicogermanate with a DFT zeotype framework (denoted as SU-57) was synthesized for the first time by ethanol-assisted hydrothermal synthesis at 160 and 170 °C. The compound was characterized by single crystal and powder X-ray diffraction, scanning and transmission electron microscopy, energy dispersive spectroscopy (EDS), thermogravimetry (TG) and solid state nuclear magnetic resonance (NMR) spectroscopy. SU-57 crystallizes in space group P42/n with estimated a ≈ 10.38–10.46 Å, c ≈ 8.88–8.91 Å, V ≈ 957–975 Å3. It has variable Al–Si–Ge composition with an approximate formula |C2H10N2| [Al(SixGe1−x)O4]2 (x ≈ 0.3–0.9), which results in a super-structure originated from different cation occupancies of the two unique tetrahedral (T) sites. Single crystal X-ray structure refinements, together with results from X-ray powder diffraction (XRPD) and EDS analysis, showed that (i) the AlO4 and (Si, Ge)O4 tetrahedra are only partially ordered over the DFT framework and do not follow a strict alternating manner. (ii) Al resides predominantly on one T site and Si and Ge predominantly on the other. (iii) The Al cation concentration (Al/(Al + Si + Ge)) is nearly constant and slightly less than 50 at%, while the Si and Ge cation concentrations vary over a large range. (iv) Al and Ge occupy both T sites. The cation disorder was confirmed by 27Al and 29Si solid state NMR. TG analysis and in situ XRPD showed that SU-57 was stable up to 375 °C in N2 atmosphere.

sted, utgiver, år, opplag, sider
2009. Vol. 117, nr 1-2, s. 285-291
Emneord [en]
Aluminosilicogermanate, DFT zeotype, Hydrothermal synthesis, X-ray diffraction, Energy dispersive spectroscopy, 27Al and 29Si solid state NMR
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-24858DOI: 10.1016/j.micromeso.2008.06.036ISI: 000262879700037OAI: oai:DiVA.org:su-24858DiVA, id: diva2:198430
Tilgjengelig fra: 2008-04-24 Laget: 2008-04-24 Sist oppdatert: 2019-12-03bibliografisk kontrollert
Inngår i avhandling
1. Open-Framework Germanates: Crystallography, structures and cluster building units
Åpne denne publikasjonen i ny fane eller vindu >>Open-Framework Germanates: Crystallography, structures and cluster building units
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis is focussing on the crystallographic challenges and what knowledge we can gain from studying the different open-framework germanates. Five new open-framework germanates have been synthesized and the structures have been determined by single crystal X-ray diffraction. A thorough description is made of the different problems raised with the different compounds, whether it is choice of crystal system in SU-61, twinning and possible ordering in SU-46, superstructure and variation in elemental content in SU-57, template disorder in JLG-5 or framework disorder in SU-44.

Open-framework germanates are often built from one type of cluster, such as the Ge7 [Ge7X19], Ge8 [Ge8X20], Ge9 [Ge9Xn, n =25-26] and Ge10 [Ge10X28], (X =O, OH, F) clusters. The structures built by clusters containing different kinds of polyhedra are discussed, with a focus on the 4-coordinated Ge7 clusters, the larger cluster aggregate found in SU-8 and SU-44 and the structures built by the Ge10 clusters.

sted, utgiver, år, opplag, sider
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2008. s. 90
Emneord
germanate, crystallography, building unit, zeotype, scale chemistry
HSV kategori
Forskningsprogram
strukturkemi
Identifikatorer
urn:nbn:se:su:diva-7501 (URN)978-91-7155-570-0 (ISBN)
Disputas
2008-05-16, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Veileder
Tilgjengelig fra: 2008-04-24 Laget: 2008-04-24bibliografisk kontrollert

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