The structure of the CAS type zeolite, Cs₄[Al₄Si₂₀O₄₈] by high-resolution powder neutron diffraction 29Si MAS and NMR

Hughes, R.W. and Weller, M.T. (2002) The structure of the CAS type zeolite, Cs₄[Al₄Si₂₀O₄₈] by high-resolution powder neutron diffraction 29Si MAS and NMR. Microporous and Mesoporous Materials, 51 (3), 189-196. (doi:10.1016/S1387-1811(01)00476-0).

Abstract

The structure Of Cs₄[Al₄Si₂₀O₄₈] with the zeolite framework type CAS has been refined using high-resolution powder neutron diffraction data. The refined distribution of silicon and aluminium is not random but has aluminium preferentially located on one of the three tetrahedral sites. This result is confirmed by 29Si MAS NMR data from the same material that also indicates that orientated O₃Si-O-AlO₃ pairs exist in the structure.

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