Zitierlink:
https://doi.org/10.26092/elib/8
Disordered but primitive gallosilicate hydro-sodalite: Structure and thermal behaviour of a framework with novel cation distribution
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Autor/Autorin: | Robben, Lars ![]() Wolpmann, Marius ![]() Bottke, Patrick ![]() Petersen, Hilke ![]() Šehović, Malik Gesing, Thorsten M. ![]() |
Zusammenfassung: | The structure of a new gallosilicate sodalite |Na6.16(1)(H2O)8|[Ga1.04(1)Si0.96(1)O4]6 described in space group with lattice parameter a = 885.208(7) pm is reported. For such a sodalite with a deviation from a 1:1 ratio in the framework cations a body-centred structure in space group could be expected. The structure shows structural stress resulting from this unusual substitution by a high strain visible in reflections which are forbidden by symmetry in . Distinct amounts of Ga and Si are redistributed on the opposite crystallographic position. The second coordination sphere of Si was examined by 29Si MAS NMR, the absence of OH− in the sodalites cages was checked by FTIR- and Raman spectroscopy. The intensity distribution of MAS NMR signal is modelled using a new technique to calculate the framework metal second neighbour coordination. The confirmed distribution leads to a low thermal stability of the cubic sodalite indicated by a new intermediated phase which could be regarded as a triclinic distorted cancrinite with three-time increased c lattice parameter. This intermediate phase decomposes at around 1000 K to a beryllonite-type sodium gallosilicate. |
Schlagwort: | Sodalite; MAS-NMR spectroscopy; Temperature-dependent behaviour | Veröffentlichungsdatum: | 15-Jan-2018 | Projekt: | Chemische Kristallographie fester Stoffe | Zeitschrift/Sammelwerk: | Microporous and Mesoporous Materials | Startseite: | 206 | Endseite: | 213 | Dokumenttyp: | Artikel/Aufsatz | ISSN: | 13871811 | Zweitveröffentlichung: | no | DOI: | 10.26092/elib/8 | URN: | urn:nbn:de:gbv:46-elib42236 | Institution: | Universität Bremen | Fachbereich: | Fachbereich 02: Biologie/Chemie (FB 02) |
Enthalten in den Sammlungen: | Forschungsdokumente |
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