A phosphoniobate with an intersecting tunnel structure related to pyrochlore: Rb[sub 3]Nb[sub 5]P[sub 2]O[sub 19]

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1994.1194· OSTI ID:6836978

Leclaire, A; Borel, M M; Chardon, J; Raveau, B ^[1]

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1. Universite de Caen (France)

A new phosphoniobate Rb[sub 3]Nb[sub 5]P[sub 2]O[sub 19] with an intersecting tunnel structure has been synthesized. It crystallizes in the R3c space group with a[sub H] = 12.989(2) [angstrom] and c[sub H] = 53.912(6) [angstrom]. The host lattice, related to the pyrochlore framework, is built up from [open quotes]Nb[sub 6]O[sub 27][close quotes] and [open quotes]Nb[sub 3]O[sub 3]O[sub 24][close quotes] units which share their corners in the (001) planes, forming [Nb[sub 2]PO[sub 8]][sub [infinity]] layers. These layers, connected through NbO[sub 6] octahedra, delimit large cages along c which contain the rubidium ions. The cages are connected through hexagonal tunnels running along (2 1 0)[sub H]. The relationships with pyrochlore and Rb[sub 10]Nb[sub 29.2]O[sub 78] are studied.

• OSTI ID: 6836978
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 111:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
LATTICE PARAMETERS
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
PORE STRUCTURE
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
RUBIDIUM OXIDES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS