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| - The Location and Ordering of Fluoride Ions in Pure Silica Zeoliteswith Framework Types IFR and STF; Implications for the Mechanismof Zeolite Synthesis in Fluoride Media
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| - Single-crystal X-ray diffraction studies carried out at a synchrotron radiation source have allowedthe structure solution and location of fluoride ions inside as-made pure silica zeolites with the IFR and STFframework structures. The local environment of the fluoride has been identified, and unusual ordering of thefluoride ions has been discovered in both cases. The details of the crystal structures are used to suggest structuralfeatures that are important in determining the ordering of fluoride ions in zeolites. A mechanism for how thefluoride ordering occurs is suggested for IFR and STF based on the local structure of small cages that makeup these zeolites, and the implications for the mechanism of crystal growth are discussed.
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