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 02.11.2006   Карта сайта     Language По-русски По-английски
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02.11.2006

Nature 444, 79-81 (2 November 2006) | doi:10.1038/nature05200; Received 12 May 2006; Accepted 30 August 2006


Complex zeolite structure solved by combining powder diffraction and electron microscopy


Fabian Gramm1, Christian Baerlocher1, Lynne B. McCusker1, Stewart J. Warrender2, Paul A. Wright2, Bada Han3, Suk Bong Hong3, Zheng Liu4,5, Tetsu Ohsuna4,6 and Osamu Terasaki4



Many industrially important materials, ranging from ceramics to catalysts to pharmaceuticals, are polycrystalline and cannot be grown as single crystals. This means that non-conventional methods of structure analysis must be applied to obtain the structural information that is fundamental to the understanding of the properties of these materials. Electron microscopy might appear to be a natural approach, but only relatively simple structures have been solved by this route. Powder diffraction is another obvious option, but the overlap of reflections with similar diffraction angles causes an ambiguity in the relative intensities of those reflections. Various ways of overcoming or circumventing this problem have been developed1, 2, and several of these involve incorporating chemical information into the structure determination process3, 4, 5, 6, 7. For complex zeolite structures, the FOCUS algorithm8, 9 has proved to be effective. Because it operates in both real and reciprocal space, phase information obtained from high-resolution transmission electron microscopy images can be incorporated directly into this algorithm in a simple way. Here we show that by doing so, the complexity limit can be extended much further. The power of this approach has been demonstrated with the solution of the structure of the zeolite TNU-9 (|H9.3|[Al9.3Si182.7O384]; ref. 10) with 24 topologically distinct (Si,Al) atoms and 52 such O atoms. For comparison, ITQ-22 (ref. 11), the most complex zeolite known to date, has 16 topologically distinct (Si,Ge) atoms.




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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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