beta. -NbPO/sub 5/ and. beta. -TaPO/sub 5/: bronzoieds, second members of the monophosphate tungsten bronze series (PO/sub 2/)/sub 4/(WO/sub 3/)/sub 2m/
Journal Article
·
· J. Solid State Chem.; (United States)
The oxides ..beta..-NbPO/sub 5/ and ..beta..-TaPO/sub 5/ have been studied by X-ray diffraction and high resolution electron microscopy. They exhibit different supercells based on an orthorhombic subcell with the parameters a/sub 0/ = 11.27 A, b/sub 0/ = 5.28 A, c/sub 0/ = 6.62 A. It is shown that their framework corresponds to the member m = 2 of the series of monophosphate tungsten bronzes (PO/sub 2/)/sub 4/(WO/sub 3/)/sub 2m/ with pentagonal tunnels (MPTB/sub P/). The structure can thus be described as built up from ReO/sub 3/-type slabs which are two octahedra wide and connected through phosphate planes. The stability of these bronzoieds is discussed with respect to that of the MPTB/sub P/ compounds. The relationships between the structures of the ..cap alpha.. and ..beta.. forms of NbPO/sub 5/ and TaPO/sub 5/ are studied.
- Research Organization:
- ISMRa, Caen, France
- OSTI ID:
- 7046186
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 65:3; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crystal structure of WPO sub 5 , the second member of the monophosphate tungsten bronze series (WO sub 3 ) sub 2m (PO sub 2 ) sub 4
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/
On the possible electronic instability of the monophosphate tungsten bronze (WO sub 3 ) sub 4 (PO sub 2 ) sub 4
Journal Article
·
Sun Oct 01 00:00:00 EDT 1989
· Journal of Solid State Chemistry; (USA)
·
OSTI ID:7247506
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/
Journal Article
·
Wed Dec 31 23:00:00 EST 1986
· J. Solid State Chem.; (United States)
·
OSTI ID:6948283
On the possible electronic instability of the monophosphate tungsten bronze (WO sub 3 ) sub 4 (PO sub 2 ) sub 4
Journal Article
·
Tue May 01 00:00:00 EDT 1990
· Journal of Solid State Chemistry; (USA)
·
OSTI ID:6550565
Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
COHERENT SCATTERING
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
LATTICE PARAMETERS
MICROSCOPY
NIOBIUM COMPLEXES
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
POWDERS
SCATTERING
SPACE GROUPS
TANTALUM COMPLEXES
TRANSITION ELEMENT COMPLEXES
X-RAY DIFFRACTION
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
COHERENT SCATTERING
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
LATTICE PARAMETERS
MICROSCOPY
NIOBIUM COMPLEXES
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
POWDERS
SCATTERING
SPACE GROUPS
TANTALUM COMPLEXES
TRANSITION ELEMENT COMPLEXES
X-RAY DIFFRACTION