Rb[sub 4]Al[sub 2]Nb[sub 35]O[sub 70]: A new reduced niobate with isolated Nb[sub 6] octahedral clusters

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

DOI:https://doi.org/10.1006/jssc.1994.1126· OSTI ID:6836960

Geselbracht, M J; Stacy, A M ^[1]

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1. Univ. of California, Berkeley, CA (United States)

Single crystals of the new reduced niobium oxide. Rb[sub 4]Al[sub 2]Nb[sub 35]O[sub 70], were grown by heating mixtures of Na[sub 3]NbO[sub 4], NbO, and RbCl in an alumina boat, sealed in a fused silica tube. Rb[sub 4]Al[sub 2]Nb[sub 35]O[sub 70] crystallizes in the trigonal space group P[bar 3]: a = 7.815(1) [angstrom], c = 26.392(9) [angstrom], with one formula unit per unit cell. The structure was determined from single crystal X-ray diffraction data and refined to an R value of 3.39%. Three distinct types of niobium atom coordination environments exist in this structure including isolated NbO[sub 6] octahedra, Nb[sub 3]O[sub 13] triangular clusters formed by 3 face-shared NbO[sub 6] octahedra, and Nb[sub 6] octahedral clusters of the type [Nb[sub 6]O[sub 12]]O[sub 6].

• OSTI ID: 6836960
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 110:1; 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
ALUMINIUM COMPOUNDS
ATOMIC CLUSTERS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
CRYSTALS
MONOCRYSTALS
NIOBATES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS