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Low-Dimensional and Extended Metal-Metal Bonded Networks in Transition Metal Compounds: Ba2Nb5O9, Ba2-xYxNb5O9

Title
Low-Dimensional and Extended Metal-Metal Bonded Networks in Transition Metal Compounds: Ba2Nb5O9, Ba2-xYxNb5O9
Authors
Lee H.-R.Kim S.-J.Yang I.-S.Choy J.-H.
Ewha Authors
김성진양인상최진호
SCOPUS Author ID
김성진scopus; 양인상scopus; 최진호scopus
Issue Date
1994
Journal Title
Journal of Solid State Chemistry
ISSN
0022-4596JCR Link
Citation
vol. 108, no. 2, pp. 253 - 259
Indexed
SCI; SCIE; SCOPUS scopus
Abstract
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 (Nb4+, Nb3+, Nb2+) in Ba2Nb5O9 and these oxidation states are expected to be stable considering their atomic coordinates. Pure BaNbO3 phase was synthesized and its niobium oxidation state was examined in order to compare with those of niobium in Ba2Nb5O9. Electrical resistivity measurements on Ba2Nb5O9 show negative dρ/dT behavior between 160 K and 600 K. Similar behavior was observed in yttrium substituted niobates, Ba2-xYxNb5O9. The possibility of relationship between low dimensionality and anomalous properties of these niobates is discussed. © 1994 Academic Press. All rights reserved.
DOI
10.1006/jssc.1994.1040
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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