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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