The stepwise dehydration process of the Baexchanged\ud form of the zeolite phillipsite was studied by\ud in situ synchrotron X-ray powder diffraction. A series of\ud structure refinements were performed using the Rietveld\ud method on powder diffraction data measured in the interval\ud between 332 and 712 K. At 482 K, more than half\ud of the water molecules were lost. The continuous water\ud loss causes the Ba cations to migrate inside the zeolite\ud channels in order to achieve a stable coordination with\ud the framework oxygens.\ud The dehydration process was completed at 663 K,\ud where a new, completely dehydrated stable phase was\ud detected. The temperature range of stability of this phase\ud was more than 100 K, thanks to the stable coordination\ud of the Ba cations with the framework oxygens. This\ud phase is the first example of completely dehydrated zeolite\ud containing divalent (barium) cations
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