Synthesis, superconducting properties and structural (including electron diffraction) studies of NaxNbO2 and LixNbO2 / Tyutyunnik A.P., Zubkov V.G., Kellerman D.G., Pereliaev V.A., Kar'kin A.E. // European Journal of Solid State and Inorganic Chemistry. - 1996. - V. 33, l. 1. - P. 53-65.

ISSN:
09924361
Type:
Article
Abstract:
Monophasic NaxNbO2 (x= 0.5 - 0.6), Tc = 4.1 K was prepared by solid state reaction between Na3NbC>4 and Nb. X-ray powder diffraction data from a monophasic sample were used for a refinement of the structure of Na0.5NbO2 (Rp = 7.4 % and R1 = 5.3 %), using the Rietveld method. At low jt-values a closely related second phase can occur. Rietveld refinement using X-ray powder diffraction data showed this phase to be isostructural with NaNbU2 but with the chemical formula Na0.1NbO2. Transmission electron microscopy studies of NaxNbO2 and LixNbO2 revealed the presence of superstructures in some crystallites. The electron diffraction patterns resemble to some extent those reported for transformations among tantalum chalcogenides. © Gauthier-Villars.
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Affiliations Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, GSP-145, Ekaterinburg, Russian Federation
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Correspondence Address Tyutyunnik, A.P.; Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, GSP-145, Ekaterinburg, Russian Federation
Language of Original Document English
Source Scopus