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- W1968596295 abstract "The structure of a single crystal of dehydrated zeolite Na−X selected from a batch grown by Petranovskii in Russia, of composition Na92Si100Al92O384 per unit cell, was determined by X-ray diffraction methods in the cubic space group Fd3̄; a = 25.077(4) Å at 21 °C. R1 = 0.054 for the 320 reflections for which Fo > 4σ(Fo); wR2 based on F2 and all data is 0.140. Na+ ions are found at four crystallographic sites. Sites I‘ and II are fully occupied with 32 Na+ ions each. The remaining 28 Na+ ions partially occupy two 12-ring (site III‘) positions with 10(4) near an O−Al−O sequence and 18(4) near an O−Si−O sequence. These results differ from those of the two previous investigations of dehydrated Na−X, which, in turn, disagree substantially with each other. The near energy equivalence of two (or more) III‘ sites, the presence of an impurity cation in one determination, and a consideration of the differing qualities of the diffraction data are sufficient to reconcile all results. The substitution of four silicon atoms per unit cell into the aluminum equipoint necessarily has a complicating effect. Considerations involving the ordering of these substituted silicon atoms are not needed." @default.
- W1968596295 created "2016-06-24" @default.
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- W1968596295 date "1999-10-07" @default.
- W1968596295 modified "2023-10-01" @default.
- W1968596295 title "Reinvestigation of the Crystal Structure of Dehydrated Sodium Zeolite X" @default.
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- W1968596295 doi "https://doi.org/10.1021/jp991817l" @default.
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