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- W1987442302 abstract "The thermal transformation of Ba exchanged zeolite X to celsian has been studied by {sup 27}Al and {sup 29}Si MAS NMR spectroscopy. Evidence for the degradation of the zeolite framework is present in the {sup 29}Si NMR spectra after thermal treatment at 850 deg. C. Confirmation is provided by the {sup 29}Si NMR data that synthesis of celsian via the decomposition of Ba exchanged zeolite leads to a single defect phase. Clustering of the isomorphous replacement of aluminium by silicon must occur to explain the observed {sup 29}Si chemical shifts. The {sup 27}Al NMR data show distorted aluminium co-ordination sites upon the thermal transformation of Ba exchanged zeolite X. The distortions present in the amorphous matrix are greater than those present in the monoclinic and hexagonal crystalline phases of celsian. - Graphical abstract: Monte Carlo simulation of the Q {sub 4}(mAl) silicon connectivity in the {alpha}-hexagonal celsian lattice, for a Si/Al ratio of 1:1. Si atoms are shown in yellow and the Al atoms in black." @default.
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- W1987442302 date "2006-07-01" @default.
- W1987442302 modified "2023-10-16" @default.
- W1987442302 title "Substitution clustering in a non-stoichiometric celsian synthesized by the thermal transformation of barium exchanged zeolite X" @default.
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- W1987442302 doi "https://doi.org/10.1016/j.jssc.2006.03.021" @default.
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