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A niobium phosphate bronze closely related to the tungsten phosphate bronzes family: Na sub 4 Nb sub 8 P sb 6 O sub 35

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A niobium phosphate bronze closely related to the tungsten

phosphate bronzes family: Na sub 4 Nb sub 8 P sub 6 O sub

35

Authors

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

Publication date

1990/11/1

Journal

Journal of Solid State Chemistry;(USA)

Volume

89

Issue

1

Description

A new niobium phosphate bronze Na {sub 4} Nb {sub 8} P {sub 6} O {sub 35} has been isolated. Its structure was solved by single crystal x-ray diffraction. It crystallizes in the orthorhombic system with the space group Pbam. The cell parameters are a= 8.4992 (7){angstrom}, b= 15.3390 (8){angstrom}, and c= 10.5913 (9){angstrom}. The framework (Nb {sub 8} P {sub 6} O {sub 35}){sub {infinity}} consists of (Nb {sub 3} P {sub 2} O {sub 17}){sub {infinity}} layers, sharing the corners of their octahedra and forming (Nb {sub 6} P {sub 4} O {sub 31}){sub {infinity}} bilayers. The latter bilayers are linked along {rvec c} through (Nb {sub 2} P {sub 2} O {sub 14}) units, built up themselves of two edge-sharing NbO {sub 6}

octahedra connected to two PO {sub 4} tetrahedra. The relationships with other niobium phosphate bronzes is also discussed as well as the great distortion of the different polyhedra of the structure.

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