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- W4236694350 abstract "<p>Previous work has shown a strong correlation between zeolite framework flexibility and the nature of structural symmetry and phase transitions. However, there is little experimental data regarding this relationship, in addition to how flexibility can be connected to the synthesis of these open framework materials. This is of interest for the synthesis of novel zeolites, which require organic additives to permutate the resulting geometry and symmetry of the framework. Here, we have used high pressure powder X-ray diffraction to study the three zeolites: Na-X, RHO and ZK-5, which can all be prepared using 18-crown-6 ether as an organic additive. We observe significant differences in how the occluded 18-crown-6 ether influences the framework flexibility – this being dependant on the geometry of the framework. We use these differences as an indicator to define the role of 18-crown-6 ether during zeolite crystallisation. Furthermore, in conjunction with previous work we predict that pressure-induced symmetry transitions are intrinsic to body-centred cubic zeolites. The high symmetry yields fewer degrees of freedom, meaning it is energetically favourable to lower the symmetry to facilitate further compression.</p>" @default.
- W4236694350 created "2022-05-12" @default.
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- W4236694350 date "2018-12-13" @default.
- W4236694350 modified "2023-10-17" @default.
- W4236694350 title "Pressure-Induced Symmetry Changes in Body-Centered Cubic Zeolites" @default.
- W4236694350 doi "https://doi.org/10.26434/chemrxiv.7455239.v1" @default.
- W4236694350 hasPublicationYear "2018" @default.
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