The crystal structures of (NH4)3HGe7O16·nH2O and Li4−xHxGe7O16·nH2O determined from powder diffraction data using synchrotron radiation
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Cited by (22)
Synthesis and crystal structure of [(Cs<inf>6</inf>F)(Cs<inf>3</inf>AgF)][Ge<inf>14</inf>O<inf>32</inf>] through alkali halide flux growth
2019, Solid State SciencesCitation Excerpt :One extended family of zeotypes are based on a Ge7O16 framework and include compounds such as Rb3HGe7O16·xH2O, Li4HGe7O16·xH2O, and Na4Ge7O16·xH2O. These compounds crystallize in tetragonal, rhombohedral, and cubic structures and consist of tetrahedral clusters of four GeO6 octahedra (formula Ge4O16) that are connected into a 3D structure by GeO4 tetrahedra [10–13]. The channels created by this framework are occupied by three or four monovalent cations (alkali metal, Ag+, or NH4+) and up to six water molecules depending on the cation identity and extent of dehydration.
Facile one-pot synthesis of dual-cation incorporated titanosilicate and its deposition to membrane surfaces for simultaneous removal of Cs<sup>+</sup> and Sr<sup>2+</sup>
2019, Applied Surface ScienceCitation Excerpt :The TiO associated peak of the Cs+ exchanged DTS was significantly red-shifted to 580 cm−1 compared to the peak of the pristine material (602 cm−1), reflecting the expansion of the TiO6 octahedral units due to exchange with the larger radius Cs+ [38]. Relatively, SiO4 tetrahedral units were considered as being essentially rigid and hence a noticeable shift of the peak from 930 cm−1 was not observed [35,39]. Direct observation of the XPS binding energy (BE) shift for the exchanged DTS is evidenced in Fig. 2f.
Rigid frameworks of zeolite-like compounds of the pharmacosiderite structure-type
2012, Microporous and Mesoporous MaterialsSynthesis and structural characterization of aluminogermanate pharmacosiderites with different crystal symmetries
2011, Microporous and Mesoporous MaterialsCitation Excerpt :Thus, its symmetry is lowered and requires two independent sites for octahedral Ge atoms. It is interesting to note here that half (7.6954 Å) an unit cell edge of the body-centered cubic KAlGe-Pha material is slightly smaller than that (7.7146 Å) of the primitive cubic LiAlGe-Pha one, like the case of their Al-free analogs [34]. There are, however, more water molecules in the LiAlGe-Pha material, because of the stronger coordination of water molecules with Li+ ions.
Topology of microporous structures
2018, Micro- and Mesoporous Mineral Phases