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Na2+ xNb6P4O26: A novel niobium phosphate bronze isotypic of the m= 3 member of the MPTBp family

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Na2+ xNb6P4O26: A novel niobium phosphate bronze isotypic of

the m= 3 member of the MPTBp family

Authors

A Benabbas, MM Borel, A Grandin, A Leclaire, B Raveau

Publication date

1991/12/1

Journal

Journal of Solid State Chemistry

Volume 95 Issue 2 Pages 245-252 Publisher Academic Press Description

A new niobium phosphate bronze Na 2+ x Nb 6 P 4 O 26 (0≤ x≤ 0.75) has been isolated. Its structure was solved by single crystal X-ray diffraction. It crystallizes in the orthorhombic system with space group P2 1 2 1 2. The cell parameters are a= 19.8050 (10), b= 14.3859 (7), and c= 5.3960 (4) A ̊. The framework is built up from ReO 3-type slabs of NbO 6 octahedra, perpendicular to a and linked by isolated PO 4 tetrahedra delimiting pentagonal tunnels running along c. The structure of this bronze corresponds to that expected for the hypothetical member m= 3 of the series of the monophosphate tungsten bronzes (MPTB p) with pentagonal tunnels (WO 3) 2m (PO 2) 4. Relationships with other niobium phosphate bronzes are also discussed.

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