Abstract
The cubic structure of thallium zeolite-A has been studied by high resolution powder neutron diffraction. Refinements in which Si and Al are strictly alternating within the aluminosilicate framework (space group Fm3c) are better than those in which each Si is linked, by oxygen bridges, to three Al and one Si (space group Pn3n). This result is in accord with recent 29Si (magic-angle spinning) NMR measurements on zeolite ZK-4 but at variance with previous interpretations of NMR measurements on the sodium form of zeolite-A. Our conclusions reaffirm earlier X-ray results.
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Cheetham, A., Eddy, M., Jefferson, D. et al. A study of Si,Al ordering in thallium zeolite-A by powder neutron diffraction. Nature 299, 24–26 (1982). https://doi.org/10.1038/299024a0
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DOI: https://doi.org/10.1038/299024a0
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