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A niobium phosphate “bronze” closely related to the Ba3Nb6Si4O26 structure: Na6Nb8P5O35

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A niobium phosphate “bronze” closely related to the

Ba3Nb6Si4O26 structure: Na6Nb8P5O35

Authors

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

Publication date

1991/5/1

Journal

Journal of Solid State Chemistry

Volume 92 Issue 1 Pages 51-56 Publisher Academic Press Description

A new niobium “bronze” Na6Nb8P5O35 has been isolated, the structure of which has been

determined from a single crystal by X-ray diffraction. This oxide crystallizes in the space group R32, a = 8.9185 (5) Å and c = 30.055 (11) Å. The mixed framework built up from corner sharing NbO6 octahedra and single PO4 tetrahedra can be described by the stacking

along c of tetrahedral [P3O6]∞ layers and [Nb8P2O29]∞ layers. The latters are closely related to the Ba3Nb6Si4O26 structure since they present identical [Nb6O27] units with identical

orientations leading to a similar “a” parameter; those units are linked through single PO4 tetrahedra and NbO6 octahedra instead of Si2O7 groups in the siliconiobate. The

similarity with the structure of K3Nb8O21 is also discussed. Attention is drawn to the existence

of wide circular galleries where Na+ ions can move freely, suggesting possible ionic

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