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Microcrystal X-ray diffraction and NMR studies of thermal expansion properties of pure silica zeolites FER and a comparison with IFR

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L A Villasescusa, P Lightfoot, R J Darton, R E Morris

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The mechanism of negative thermal expansion in a purely siliceous form of zeolite FER is compared with that of zeolite IFR. At first glance the materials seem to show vastly differing behaviour - FER shows positive thermal expansion LIP to a phase transition (similar to 400K) above which it is a negative thermal expansion, IFR is a negative thermal expansion material at all temperatures so far measured. A comparison of the two mechanisms is made and a series of rules' about the magnitude of negative thermal expansion is discussed.



Original languageEnglish
PublisherUnknown Publisher
Number of pages5
Publication statusPublished - 2004

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