Structural Disorder of a New Zeolite-like Lithosilicate, K2.6Li5.4[Li4Si16O38]4.3H2O
The framework structure of the synthetic microporous lithosilicate RUB-30 (K{sub 2.6}Li{sub 5.4}[Li{sub 4}Si{sub 16}O{sub 38}]{sub 4.3}H{sub 2}O) is similar to that of the fibrous zeolites such as natrolite, edingtonite and thomsonite, since all their frameworks include the same secondary structural building unit, the so-called 4-1 T{sub 5}O{sub 10} cluster of tetrahedra. Unique to the structure of RUB-30, each 4-1 unit consists of a LiSi4O10 moiety within which the single [LiO4] tetrahedron is strictly segregated from the other four [SiO4] tetrahedra. The connection of neighboring 4-1 units through edge-sharing [LiO4] tetrahedra results in a new framework topology. The present work reports an 'average' structure of RUB-30 solved by synchrotron X-ray single-crystal diffraction data collected at a second-generation source. A superstructure with a x 2b x c (relative to the subcell quoted above) could be seen in X-ray diffraction data collected with better resolution and higher brightness at a third generation source. Diffuse streaks along k with l = odd and unusual superstructure hkl reflections, with k = odd and l = odd only, indicate a more complicated real structure of the material. To explain this observation we propose two different structure types which are statistically, but coherently, intergrown in RUB-30.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 913995
- Report Number(s):
- BNL-78563-2007-JA; ACBCAR; TRN: US0801459
- Journal Information:
- Acta Cryst. B, Vol. 62; ISSN 0567-7408
- Country of Publication:
- United States
- Language:
- English
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