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Novel synthetic alkali‐yttrium silicates with a new microporous mixed framework topology: (Rb,Cs) 9 Y 7 Si 24 O 63 and isotypic Rb 9 Y 7 Si 24 O 63
Author(s) -
WierzbickaWieczorek M.,
Kolitsch U.,
Tillmanns E.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200800325
Subject(s) - microporous material , octahedron , alkali metal , crystallography , tetrahedron , yttrium , crystal structure , silicate , crystal (programming language) , flux method , chemistry , aluminosilicate , space (punctuation) , materials science , single crystal , computer science , oxide , organic chemistry , programming language , biochemistry , operating system , catalysis
Prismatic colourless crystals of the two novel, isotypic title compounds were obtained by the flux growth technique. The crystal structures have been determined from single‐crystal intensity data in space group R 3 with a = 28.819(4) / 28.799(4), c = 13.916(3) / 13.864(3) Å, V = 10009(3) / 9958(3) Å 3 , Z = 6, R ( F ) = 4.99 / 6.44%, respectively. They represent a novel structure type with microporous character. The framework is built from six‐membered silicate rings (approximate UDUDUD orientation) containing isolated YO 6 octahedra and compressed “six‐membered rings”, which in fact build a spiral of corner‐sharing SiO 4 tetrahedra. Approximately parallel to [111] run two different irregular channels hosting the Rb/Cs and Rb atoms. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)