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The niobium phosphate bronze K5− xNb8P5O34, a new tunnel structure, first member of the series (K3Nb6P4O26) n· KNb2PO8

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The niobium phosphate bronze K5− xNb8P5O34, a new tunnel

structure, first member of the series (K3Nb6P4O26) n· KNb2PO8

Authors

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

Publication date

1990/8/1

Journal

Journal of Solid State Chemistry

Volume 87 Issue 2 Pages 360-365 Publisher Academic Press Description

A new niobium phosphate bronze K 5− x Nb 8 P 5 O 34 has been isolated. The structure of this phase has been determined from a single crystal of composition K 4 Nb 8 P 5 O 34 by X-ray diffraction. It crystallizes in the space group P2 c with a= 13.904 (6) Å, b= 6.453 (3) Å, c= 20.64 (1) Å, β= 125.05°(1). This structure consists of [Nb 3 P 2 O 13]∞ layers parallel to (100) linked through PO 4 tetrahedra and [Nb 2 O 11] units. The structural relationships between this bronze and the other members of the series (K 3 Nb 6 P 4 O 26) n KNb 2 PO 8 are discussed. Attention is drawn to the fact that for this particular n= 1 value two structural forms can be expected.

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