Abstract
A novel GeO 2 or (Si,Ge)O 2 zeolite phase called IM-10 was obtained in the presence of the well-known hexamethonium ion as template and in fluoride media, from gels with Ge/Si molar ratios ⩾1. With decrease of the Ge/Si molar ratio, BEC-type zeolite and ITH-type zeolite were successively obtained. The recovered IM-10 samples were characterized by X-ray diffraction, SEM, elemental and thermal analysis, 19F MAS and 1H liquid (after dissolution of the samples in HF) spectroscopies. Due to the small crystal sizes (1–4 μm), the structure was determined from powder X-ray diffraction (of the GeO 2 as-made sample) and refined by the Rietveld method. IM-10 is a new member of the clathrate family. It crystallizes in the tetragonal symmetry, the space group being P 4 ¯ n 2 . The framework is made of F −-containing D4R units, bridged by GeO 4 tetrahedra. The arrangement of the D4R units creates [6 204 2] supercages, each of them occluding one hexamethonium cation. Structural similarities exist between ASU-9 ( AST), ASU-7 ( ASV) and the new IM-10 zeolite with a novel topology ( UOZ).
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