Lee, Yongjae Kim, Sun Jin Bull, Ivor Celestian, Aaron J. Parise, John B. Kao, Chi-Chang Vogt, Thomas 2024-01-21T00:05:09Z 2024-01-21T00:05:09Z 2021-09-02 2007-11-07 0002-7863 https://pubs.kist.re.kr/handle/201004/133982 A new potassium gallosilicate zeolite with a natrolite topology (approximate formula K8.2Ga8.2-Si11.8O40 center dot 11.5H(2)O) was synthesized under hydrothermal conditions and characterized as a function of temperature using monochromatic synchrotron X-ray powder diffraction and Rietveld analyses. Unlike the previously known tetragonal K8Ga8Si12O40 center dot 6H(2)O phase, the as-synthesized material contains twice the amount of water molecules in an ordered arrangement throughout the channels in an orthorhombic (/2(1)2(1)2(1)) symmetry. The ordered configuration of water molecules is stabilized below 300 K, whereas heating above 300 K results in a selective dehydration and subsequent disordering of water molecules in a tetragonal (/42d) symmetry. Above 400 K, the material transforms to a fully dehydrated tetragonal phase with a concomitant volume reduction of ca. 15%. The fully dehydrated material transforms back to its original state when rehydrated over a period of up to 2 weeks. The distribution of potassium cations within the channels remains largely unperturbed during the water rearrangements and their order-disorder transition within the channels. English AMER CHEMICAL SOC PRESSURE-INDUCED HYDRATION SYNCHROTRON X-RAY POWDER DIFFRACTION CRYSTAL-STRUCTURES ZEOLITE RHO GALLIUM TEMPERATURE FRAMEWORK INSIGHT NAT Dehydration-induced water disordering in a synthetic potassium gallosilicate natrolite Article 10.1021/ja075037z 1 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.129, no.44, pp.13744 - 13748 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 129 44 13744 13748 scie scopus 000250819200062 2-s2.0-35949004503 Chemistry, Multidisciplinary Chemistry Article PRESSURE-INDUCED HYDRATION SYNCHROTRON X-RAY POWDER DIFFRACTION CRYSTAL-STRUCTURES ZEOLITE RHO GALLIUM TEMPERATURE FRAMEWORK INSIGHT NAT Dehydration Zeolite Gallosilicate Natrolite PIH