Abstract
The aluminosilicate LZ-135 was one of the first zeolites to be prepared in the presence of two or more organic structure-directing agents (in this case, Me4N+ (TMA) and Et4N+ (TEA)) and was patented 20 years ago. However, the material was polycrystalline, and at the time, its aluminosilicate framework structure could not be determined. In view of the fact that methods of structure determination from powder diffraction data have developed considerably in the meantime, a fresh analysis of the problem was undertaken. High-resolution synchrotron powder diffraction data were collected on a calcined sample of LZ-135 (as synthesized composition ca. |Na26TMA6|[Si76Al32O216]), and the new powder charge-flipping structure-solution algorithm was applied. The framework structure (P63/mmc; a = 31.3830(2) A, c = 7.6513(1) A) was revealed immediately, and then the positions of the Na+ ions and a few water molecules were located in a series of difference electron density maps. The [001] projection of the framework struct...
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