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Title

K-paracelsian (KAlSi3O8 H2O) and identification of a simple building scheme of dense double-crankshaft zeolite topologies

AuthorsBoruntea, C.R.; Vennestrøm, Peter N. R.; Lundegaard, L.F.
Issue DateJan-2019
PublisherInternational Union of Crystallography
CitationIUCrJ 6(1): 66-71 (2019)
AbstractDuring screening of the phase space using KOH and 1-methyl-4-aza-1-azoniabicyclo­[2.2.2]octane hydroxide (1-methyl-DABCO) under hydrothermal zeolite synthesis conditions, K-paracelsian was synthesized. Scanning electron microscopy, energy dispersive X-ray spectroscopy and ex situ powder X-ray diffraction analysis revealed a material that is compositionally closely related to the mineral microcline and structurally closely related to the mineral paracelsian, both of which are feldspars. In contrast to the feldspars, K-paracelsian contains intrazeolitic water corresponding to one molecule per cage. In the case of K-paracelsian it might be useful to consider it a link between feldspars and zeolites. It was also shown that K-paracelsian can be described as the simplest endmember of a family of dense double-crankshaft zeolite topologies. By applying the identified building principle, a number of known zeolite topologies can be constructed. Furthermore, it facilitates the construction of a range of hypothetical small-pore structures that are crystallo-chemically healthy, but which have not yet been realized experimentally.
Publisher version (URL)http://dx.doi.org/10.1107/S2052252518016111
URIhttp://hdl.handle.net/10261/210451
DOI10.1107/S2052252518016111
Identifiersdoi: 10.1107/S2052252518016111
issn: 2052-2525
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