Preparation and crystal structure of a new reduced rubidium niobium oxide: [Rb[sub 1. 51]Nb[sub 10]O[sub 17]]
Journal Article
·
· Materials Research Bulletin; (United States)
- Yamanashi Univ., Kofu (Japan). Faculty of Engineering
- Oregon State Univ., Corvallis, OR (United States). Dept. of Chemistry
A new reduced rubidium niobium oxide, Rb[sub 1.51]Nb[sub 10]O[sub 17], was prepared by high temperature reaction of RbNbO[sub 3] and Nb in an evacuated silica tube. The niobium oxide crystallized in the trigonal system with a = 6.020(1) and c = 38.703(8)[angstrom], space group R[bar 3]m, and Z = 3. The crystal structure was determined by single crystal X-ray diffraction analysis, and the final R factors were R = 0.053 and Rw = 0.064 for 352 unique reflections. There are three different types of niobium in this oxide. The reduced niobium is in octahedral [Nb[sub 6]O[sub 12]]O[sub 6] clusters which form layers perpendicular to the c-axis. In addition, there are two types of fully oxidized niobium: Nb(2) octahedrally coordinated by six oxygens and Nb(3) tetrahedrally coordinated by four oxygens. The Nb(2)O[sub 6] octahedra and Nb(3)O[sub 4] tetrahedra are linked by corner-sharing and are sandwiched between the [Nb[sub 6]O[sub 12]]O[sub 6] cluster layers. Rubidium is randomly distributed in a site coordinated by nine oxygens in the region of the Nb(2)O[sub 6] octahedra and Nb(3)O[sub 4] tetrahedra. Evidence for superconductivity was sought, but not found, down to 4.2 K.
- OSTI ID:
- 5356018
- Journal Information:
- Materials Research Bulletin; (United States), Journal Name: Materials Research Bulletin; (United States) Vol. 29:1; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Rb[sub 4]Al[sub 2]Nb[sub 35]O[sub 70]: A new reduced niobate with isolated Nb[sub 6] octahedral clusters
Preparation and crystal structure of new potassium niobium oxides: K{sub 2}M{sub 2}Nb{sub 4}O{sub 13} (M = Mg,Fe)
Preparation and crystal structure of layered niobium oxides: Rb(Mg{sub 0.34}Nb{sub 1.66})O{sub 5} and K(Fe{sub 0.43}Nb{sub 1.57})O{sub 5}
Journal Article
·
Sun May 01 00:00:00 EDT 1994
· Journal of Solid State Chemistry; (United States)
·
OSTI ID:6836960
Preparation and crystal structure of new potassium niobium oxides: K{sub 2}M{sub 2}Nb{sub 4}O{sub 13} (M = Mg,Fe)
Journal Article
·
Thu May 01 00:00:00 EDT 1997
· Materials Research Bulletin
·
OSTI ID:509194
Preparation and crystal structure of layered niobium oxides: Rb(Mg{sub 0.34}Nb{sub 1.66})O{sub 5} and K(Fe{sub 0.43}Nb{sub 1.57})O{sub 5}
Journal Article
·
Mon Nov 30 23:00:00 EST 1998
· Materials Research Bulletin
·
OSTI ID:329095
Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
RUBIDIUM OXIDES
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
RUBIDIUM OXIDES
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS