| | 1 | Author
| Vibrational Spectra, Sandra Loss, Caroline Röhr | Requires cookie* | | | Title
| RbAsF6, CsA sF 6 und RbSbF6: Kristallstrukturen, Thermische Phasenumwandlungen und Schwingungsspektren RbAsF6, CsAsF6 and RbSbF6: Crystal Structures, Thermal Phase Transitions  | | | | Abstract
| The title compounds are isostructural to CsSbFö and crystallize with the KOsFö structure type (space group RS, Z = 3) with the lattice constants a = 749.7(1) pm, c = 758.9(1) pm (RbAsFö), a = 772.3(1) pm, c = 805.0(1) pm (CsAsFö) and a = 767.0(1) pm, c = 786.1(2) pm (RbSbF6). The structures exibit nearly ideal [MFö]-octahedra, the alkaline cations are coordinated by 12 fluorine ions in a distorted cuboctahedral geometry. Cations and complex anions form a slightly distorted CsCl arrangement. On heating, the arsenates transform to a NaCl arrangement with disordered [AsF6] ions, whereas the antimonates of Rb and Cs form the corresponding disordered CsCl type at higher temperatures. The phase transitions and the i. r. and Raman spectra as well as the structural relations to the remaining hexafluoropnictates A![MVF6] are discussed. | | | |
Reference
| (Z. Naturforsch. 53b, 75—80 [1998]; eingegangen am 14. Oktober 1997) | | | |
Published
| 1998 | | | |
Keywords
| Alkaline Hexafluoropnictates, Crystal Structure, Thermal Phase Transitions, Vibrational Spectra | | | |
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| default:Reihe_B/53/ZNB-1998-53b-0075.pdf | | | | Identifier
| ZNB-1998-53b-0075 | | | | Volume
| 53 | |
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