Low-dimensional and extended metal-metal bonded networks in transition metal compounds: Ba[sub 2]Nb[sub 5]O[sub 9], Ba[sub 2[minus]x]Y[sub x]Nb[sub 5]O[sub 9]
Journal Article
·
· Journal of Solid State Chemistry; (United States)
- Ewha Women's Univ., Seoul (Korea, Republic of)
- Seoul National Univ. (Korea, Republic of)
The crystal structure, oxidation state, electronic properties of unusual niobates which contain niobium clusters condensed low dimensionally, were investigated by X-ray diffraction, X-ray photoelectron spectroscopy (XPS), electrical resistivity measurements, and Raman spectroscopy. The results of XPS experiment indicate that there are three niobium oxidation states (Nb[sup 4+], Nb[sup 3+], Nb[sup 2+]) in Ba[sub 2]Nb[sub 5]O[sub 9] and these oxidation states are expected to be stable considering their atomic coordinates. Pure BaNbO[sub 3] phase was synthesized and its niobium oxidation state was examined in order to compare with those of niobium in Ba[sub 2]Nb[sub 5]O[sub 9]. Electrical resistivity measurements on Ba[sub 2]Nb[sub 5]O[sub 9] show negative dp/dT behavior between 160 K and 600 K. Similar behavior was observed in yttrium substituted niobates, Ba[sub 2[minus]x]Y[sub x]Nb[sub 5]O[sub 9]. The possibility of relationship between low dimensionality and anomalous properties of these niobates is discussed.
- OSTI ID:
- 5047729
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 108:2; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBATES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
VALENCE
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBATES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
VALENCE
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS