The crystal structures of α-Rb7Sb3Br16, α- And β-Tl7Bi3Br16 and their relationship to close packings of spheres
Chang JH, Doert T, Ruck M (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 235
Pages Range: 255-261
Journal Issue: 8-9
DOI: 10.1515/zkri-2020-0013
Abstract
Yellow prismatic crystals of rubidium bromido-antimonate(III) Rb7Sb3Br16 and of two different modifications of thallium bromido-bismuthate(III) Tl7Bi3Br16 were obtained by solvent-free synthesis and by precipitation from acidic aqueous solutions. X-ray diffraction analyses revealed the Tl7Bi3I16-type for α-Tl7Bi3Br16 (orthorhombic, Cmcm, a = 2324.31(8) pm, b = 1346.69(4) pm, c = 3460.0(1) pm; Pearson symbol oC312) and a new structure type for β-Tl7Bi3Br16 (monoclinic, C2/c, a = 2331.87(5) pm, b = 1343.33(3) pm, c = 3546.01(7) pm, β = 102.708(1)°; mC312). The antimonate Rb7Sb3Br16 adopts the Tl7Bi3I16-type, too (orthorhombic, Cmcm, a = 2347.16(3) pm, b = 1357.89(5) pm, c = 3539.47(9) pm; oC312). The crystal structures of α- and β-Tl7Bi3Br16 comprise alternating slabs of isolated [BiBr6]3- octahedra and [Bi2Br10]4-octahedra pairs. Both structure types are hierarchically organized and can be regarded as sphere close packing with the same stacking sequence, if octahedra and octahedra pairs are replaced by spheres of equal size. The structural relationship between the Tl7Bi3I16-type and the hydrate Na7Bi3Br16 · 18H2O, which comprises similar structural features, is discussed.
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How to cite
APA:
Chang, J.-H., Doert, T., & Ruck, M. (2020). The crystal structures of α-Rb7Sb3Br16, α- And β-Tl7Bi3Br16 and their relationship to close packings of spheres. Zeitschrift fur Kristallographie - Crystalline Materials, 235(8-9), 255-261. https://doi.org/10.1515/zkri-2020-0013
MLA:
Chang, Jen-Hui, Thomas Doert, and Michael Ruck. "The crystal structures of α-Rb7Sb3Br16, α- And β-Tl7Bi3Br16 and their relationship to close packings of spheres." Zeitschrift fur Kristallographie - Crystalline Materials 235.8-9 (2020): 255-261.
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