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Na4− xNb7P4O29: A phosphate niobium bronze intergrowth of the membersm= 3 andm= 4 of the MPTB's series Nax (NbO3) 2m (PO2) 4

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Na4− xNb7P4O29: A phosphate niobium bronze intergrowth of the

membersm= 3 andm= 4 of the MPTB's series Nax (NbO3) 2m

(PO2) 4

Authors

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

Publication date

1992/11/1

Journal

Journal of Solid State Chemistry

Volume 101 Issue 1 Pages 137-144 Publisher Academic Press Description

A new niobium phosphate bronzeNa4−xNb7P4O29(0 ≤ x ≤ 1) has been isolated. It crystallizes in the

space groupC2/c witha = 32.850(4), b = 5.3484(4), andc = 13.252(2)A˚and β = 97.79(1)°. The structure was solved by X-ray diffraction on a twinned crystal with an (100) twinning plane. This oxide is an intergrowth of them = 3 andm = 4 members of the series of the monophosphate tungsten bronzes with pentagonal tunnels (MPTBp), corresponding to the formulation Nax(NbO3)2m(PO2)4. The

ReO3 slabs alternate parallel to (100) and are linked by isolated PO4 tetrahedra delimiting pentagonal

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