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- W2024584546 abstract "Abstract The structures of three hydrated germanates K 3 HGe 7 O 16 · 3.1 H 2 O, Rb 3 HGe 7 O 16 · 3.1 H 2 O and Cs 3 HGe 7 O 16 · 2.3 H 2 O have been determined in space group I 23, no. 197, Z = 8, with a = 15.34960(4) Å, 15.45998(4) Å and 15.56660(4) Å, respectively, from Rietveld refinement of powder diffraction patterns collected using synchrotron radiation. The structure of these germanates consists of a three-dimensional framework of tetrahedrally and octahedrally coordinated Ge atoms, with charge compensating cations and water molecules occupying the interconnecting channels. The cations occupy sites near the centres of two types of window approximately 3.3 Å across. One window is nearly circular whilst the other is more elliptical. On partial dehydration, the body-centred superstructure is lost for the Rb and Cs compounds. The structures of Rb 3 HGe 7 O 16 · 0.69 H 2 O and Cs 3 HGe 7 O 16 · 0.70 H 2 O have been refined in space group P [unk]3 m , no. 215, Z = 1, with a = 7.66990(1) Å and 7.73347(3) Å, respectively. In these materials the window apertures are now identical and are circular. For the partially dehydrated K form a 2 × 2 × 2 face-centred cubic structure forms, with a lattice parameter similar to the body-centred hydrated form, a = 15.0844(2) Å." @default.
- W2024584546 created "2016-06-24" @default.
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- W2024584546 date "1996-06-01" @default.
- W2024584546 modified "2023-09-27" @default.
- W2024584546 title "The crystal structures of hydrated and partially dehydrated M<sub>3</sub>HGe<sub>7</sub>O<sub>16</sub> · <i>n</i>H<sub>2</sub>O, (M = K, Rb, Cs), determined from powder diffraction data using synchrotron radiation" @default.
- W2024584546 cites W2313184571 @default.
- W2024584546 doi "https://doi.org/10.1524/zkri.1996.211.6.378" @default.
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