Na/sub x/P/sub 4/W/sub 14/O/sub 50/: the sodium m = 7 member of the monophosphate tungsten bronze series A/sub x/(PO/sub 2/)/sub 4/(WO/sub 3/)/sub 2m/
The structure of Na/sub 1.7/P/sub 4/W/sub 14/O/sub 50/ was established by single crystal X-ray analysis. The compound is the m = 7 member of the family of monophosphate tungsten bronzes with hexagonal tunnels, Na/sub x/(PO/sub 2/)/sub 4/ (WO/sub 3/)/sub 2m/, characterized by ReO/sub 3/-type slabs of various widths connected through PO/sub 4/ tetrahedra. In order to compare with other members of the MPTB/sub h/ family, a cell symmetry Al has been chosen with a = 6.575(2), b = 5.304(1), c = 27.076(3) A, ..cap alpha.. = 89.62(1), ..beta.. = 96.17(1), and ..gamma.. = 90.26(1)/sup 0/. The refinement has led to R = 0.040 and R/sub w/ = 0.036 for 6634 reflections with sigma(I)/I less than or equal to 0.333. A comparative study is carried out concerning the behavior of the alkaline ions in that sort of framework and especially their coordination state in the O/sub 18/ cages.
- Research Organization:
- Universite de Caen, France
- OSTI ID:
- 6948283
- Journal Information:
- J. Solid State Chem.; (United States), Vol. 66:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PHOSPHORUS OXIDES
CRYSTAL STRUCTURE
SODIUM COMPOUNDS
TUNGSTEN OXIDES
EXPERIMENTAL DATA
LATTICE PARAMETERS
MONOCRYSTALS
SPACE GROUPS
TRICLINIC LATTICES
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTALS
DATA
DIFFRACTION
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies