A niobium phosphate bronze closely related to the ITB tungsten bronzes: K sub 7 Nb sub 14+x P sub 9-x O sub 60 (x = 0. 13)

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(89)90174-6· OSTI ID:6952214

Leclaire, A; Benabbas, A; Borel, M M; Grandin, A; Raveau, B ^[1]

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1. ISMR, Caen (France)

A new niobium phosphate bronze K{sub 7}Nb{sub 14+x}P{sub 9-x}O{sub 60} has been isolated and its structure has been determined by X-ray diffraction from a single crystal. It crystallizes in the orthorhombic system, space group Pmma, with a = 36.883(3) {angstrom}, b = 10.603(1) {angstrom} and c = 6.4526(5) {angstrom}. The mixed framework of this bronze is closely related to the intergrowth tungsten bronzes (ITB): it consists of (Nb{sub 3}P{sub 2}O{sub 13}){sub {infinity}} layers deduced from the ITB (Mo{sub 5}O{sub 15}){sub {infinity}} layers observed in Sb{sub 2}Mo{sub 10}O{sub 31} by replacing two octahedra out of five by PO{sub 4} tetrahedra. Four such layers are stacked along a, sharing the corners of their polyhedra, forming (Nb{sub 12}P{sub 8}O{sub 52}){sub {infinity}} slabs connected through (NbP{sub 2}O{sub 8}){sub {infinity}} chains related to the perovskite and to the hexagonal tunnels. This host lattice determinates five types of tunnels of the brownmillerite and of the hexagonal tungsten bronzes, where K{sup +} ions are located.

• OSTI ID: 6952214
• Journal Information: Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 83:2; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BRONZE
CHALCOGENIDES
COPPER ALLOYS
COPPER BASE ALLOYS
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
ELECTRIC CONDUCTORS
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NIOBIUM COMPOUNDS
NIOBIUM PHOSPHATES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
REFRACTORY METAL COMPOUNDS
SYNTHESIS
TIN ALLOYS
TRANSITION ELEMENT COMPOUNDS