Structure of the VO/sub 2/F/sub 4//sup 3 -/ ion: crystal structure of (NH/sub 4/)/sub 3/VO/sub 2/F/sub 4/
The VO/sub 2/F/sub 4//sup 3 -/ ion has a cis octahedral structure, as is shown by single crystal structure analysis of the title compound. The unit cell of (NH/sub 4/)/sub 3/ VO/sub 2/F/sub 4/ (space group Immm or I222, a = 912.6(2), b = 1881.8(4), c = 626.4(1) pm, Z = 6) contains two symmetrically independent anions. One is rotationally disordered. Oxo and fluoro ligands cannot be distinguished. But the second one has a distorted cis octahedral structure with the lengths 170.0(4), 186.1(4), and 202.3(4) pm for the V-O, V-F (axial), and V-F (equatorial)bonds. Infrared and Raman spectra as well as theoretical considerations support the crystallographic results. The phase transitions at 418 and 215 K were confirmed by variable temperature X-ray powder diffraction. Above 418 K the cubic cryolite type structure is adopted with a = 902.6(2) pm. Plausible mechanisms for the phase transitions are suggested.
- Research Organization:
- Univ. of Muenster, West Germany
- OSTI ID:
- 7034647
- Journal Information:
- J. Solid State Chem.; (United States), Vol. 65:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMMONIUM COMPLEXES
CRYSTAL STRUCTURE
OXYFLUORIDES
VANADIUM COMPOUNDS
BOND ANGLE
BOND LENGTHS
EXPERIMENTAL DATA
LATTICE PARAMETERS
MONOCRYSTALS
POWDERS
SPACE GROUPS
X-RAY DIFFRACTION
COHERENT SCATTERING
COMPLEXES
CRYSTALS
DATA
DIFFRACTION
DIMENSIONS
FLUORINE COMPOUNDS
HALOGEN COMPOUNDS
INFORMATION
LENGTH
NUMERICAL DATA
OXYGEN COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies